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Diffstat (limited to 'srcs/wordpress/wp-includes/wp-db.php')
| -rw-r--r-- | srcs/wordpress/wp-includes/wp-db.php | 3625 |
1 files changed, 3625 insertions, 0 deletions
diff --git a/srcs/wordpress/wp-includes/wp-db.php b/srcs/wordpress/wp-includes/wp-db.php new file mode 100644 index 0000000..1be0412 --- /dev/null +++ b/srcs/wordpress/wp-includes/wp-db.php @@ -0,0 +1,3625 @@ +<?php +/** + * WordPress DB Class + * + * Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)} + * + * @package WordPress + * @subpackage Database + * @since 0.71 + */ + +/** + * @since 0.71 + */ +define( 'EZSQL_VERSION', 'WP1.25' ); + +/** + * @since 0.71 + */ +define( 'OBJECT', 'OBJECT' ); +// phpcs:ignore Generic.NamingConventions.UpperCaseConstantName.ConstantNotUpperCase +define( 'object', 'OBJECT' ); // Back compat. + +/** + * @since 2.5.0 + */ +define( 'OBJECT_K', 'OBJECT_K' ); + +/** + * @since 0.71 + */ +define( 'ARRAY_A', 'ARRAY_A' ); + +/** + * @since 0.71 + */ +define( 'ARRAY_N', 'ARRAY_N' ); + +/** + * WordPress Database Access Abstraction Object + * + * It is possible to replace this class with your own + * by setting the $wpdb global variable in wp-content/db.php + * file to your class. The wpdb class will still be included, + * so you can extend it or simply use your own. + * + * @link https://codex.wordpress.org/Function_Reference/wpdb_Class + * + * @since 0.71 + */ +class wpdb { + + /** + * Whether to show SQL/DB errors. + * + * Default behavior is to show errors if both WP_DEBUG and WP_DEBUG_DISPLAY + * evaluated to true. + * + * @since 0.71 + * @var bool + */ + var $show_errors = false; + + /** + * Whether to suppress errors during the DB bootstrapping. + * + * @since 2.5.0 + * @var bool + */ + var $suppress_errors = false; + + /** + * The last error during query. + * + * @since 2.5.0 + * @var string + */ + public $last_error = ''; + + /** + * Amount of queries made + * + * @since 1.2.0 + * @var int + */ + public $num_queries = 0; + + /** + * Count of rows returned by previous query + * + * @since 0.71 + * @var int + */ + public $num_rows = 0; + + /** + * Count of affected rows by previous query + * + * @since 0.71 + * @var int + */ + var $rows_affected = 0; + + /** + * The ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT). + * + * @since 0.71 + * @var int + */ + public $insert_id = 0; + + /** + * Last query made + * + * @since 0.71 + * @var string + */ + var $last_query; + + /** + * Results of the last query made + * + * @since 0.71 + * @var array|null + */ + var $last_result; + + /** + * MySQL result, which is either a resource or boolean. + * + * @since 0.71 + * @var mixed + */ + protected $result; + + /** + * Cached column info, for sanity checking data before inserting + * + * @since 4.2.0 + * @var array + */ + protected $col_meta = array(); + + /** + * Calculated character sets on tables + * + * @since 4.2.0 + * @var array + */ + protected $table_charset = array(); + + /** + * Whether text fields in the current query need to be sanity checked. + * + * @since 4.2.0 + * @var bool + */ + protected $check_current_query = true; + + /** + * Flag to ensure we don't run into recursion problems when checking the collation. + * + * @since 4.2.0 + * @see wpdb::check_safe_collation() + * @var bool + */ + private $checking_collation = false; + + /** + * Saved info on the table column + * + * @since 0.71 + * @var array + */ + protected $col_info; + + /** + * Log of queries that were executed, for debugging purposes. + * + * @since 1.5.0 + * @since 2.5.0 The third element in each query log was added to record the calling functions. + * @since 5.1.0 The fourth element in each query log was added to record the start time. + * @since 5.3.0 The fifth element in each query log was added to record custom data. + * + * @var array[] { + * Array of queries that were executed. + * + * @type array ...$0 { + * Data for each query. + * + * @type string $0 The query's SQL. + * @type float $1 Total time spent on the query, in seconds. + * @type string $2 Comma separated list of the calling functions. + * @type float $3 Unix timestamp of the time at the start of the query. + * @type array $4 Custom query data. + * } + * } + */ + var $queries; + + /** + * The number of times to retry reconnecting before dying. + * + * @since 3.9.0 + * @see wpdb::check_connection() + * @var int + */ + protected $reconnect_retries = 5; + + /** + * WordPress table prefix + * + * You can set this to have multiple WordPress installations + * in a single database. The second reason is for possible + * security precautions. + * + * @since 2.5.0 + * @var string + */ + public $prefix = ''; + + /** + * WordPress base table prefix. + * + * @since 3.0.0 + * @var string + */ + public $base_prefix; + + /** + * Whether the database queries are ready to start executing. + * + * @since 2.3.2 + * @var bool + */ + var $ready = false; + + /** + * Blog ID. + * + * @since 3.0.0 + * @var int + */ + public $blogid = 0; + + /** + * Site ID. + * + * @since 3.0.0 + * @var int + */ + public $siteid = 0; + + /** + * List of WordPress per-blog tables + * + * @since 2.5.0 + * @see wpdb::tables() + * @var array + */ + var $tables = array( + 'posts', + 'comments', + 'links', + 'options', + 'postmeta', + 'terms', + 'term_taxonomy', + 'term_relationships', + 'termmeta', + 'commentmeta', + ); + + /** + * List of deprecated WordPress tables + * + * categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539 + * + * @since 2.9.0 + * @see wpdb::tables() + * @var array + */ + var $old_tables = array( 'categories', 'post2cat', 'link2cat' ); + + /** + * List of WordPress global tables + * + * @since 3.0.0 + * @see wpdb::tables() + * @var array + */ + var $global_tables = array( 'users', 'usermeta' ); + + /** + * List of Multisite global tables + * + * @since 3.0.0 + * @see wpdb::tables() + * @var array + */ + var $ms_global_tables = array( + 'blogs', + 'blogmeta', + 'signups', + 'site', + 'sitemeta', + 'sitecategories', + 'registration_log', + ); + + /** + * WordPress Comments table + * + * @since 1.5.0 + * @var string + */ + public $comments; + + /** + * WordPress Comment Metadata table + * + * @since 2.9.0 + * @var string + */ + public $commentmeta; + + /** + * WordPress Links table + * + * @since 1.5.0 + * @var string + */ + public $links; + + /** + * WordPress Options table + * + * @since 1.5.0 + * @var string + */ + public $options; + + /** + * WordPress Post Metadata table + * + * @since 1.5.0 + * @var string + */ + public $postmeta; + + /** + * WordPress Posts table + * + * @since 1.5.0 + * @var string + */ + public $posts; + + /** + * WordPress Terms table + * + * @since 2.3.0 + * @var string + */ + public $terms; + + /** + * WordPress Term Relationships table + * + * @since 2.3.0 + * @var string + */ + public $term_relationships; + + /** + * WordPress Term Taxonomy table + * + * @since 2.3.0 + * @var string + */ + public $term_taxonomy; + + /** + * WordPress Term Meta table. + * + * @since 4.4.0 + * @var string + */ + public $termmeta; + + // + // Global and Multisite tables + // + + /** + * WordPress User Metadata table + * + * @since 2.3.0 + * @var string + */ + public $usermeta; + + /** + * WordPress Users table + * + * @since 1.5.0 + * @var string + */ + public $users; + + /** + * Multisite Blogs table + * + * @since 3.0.0 + * @var string + */ + public $blogs; + + /** + * Multisite Blog Metadata table + * + * @since 5.1.0 + * @var string + */ + public $blogmeta; + + /** + * Multisite Registration Log table + * + * @since 3.0.0 + * @var string + */ + public $registration_log; + + /** + * Multisite Signups table + * + * @since 3.0.0 + * @var string + */ + public $signups; + + /** + * Multisite Sites table + * + * @since 3.0.0 + * @var string + */ + public $site; + + /** + * Multisite Sitewide Terms table + * + * @since 3.0.0 + * @var string + */ + public $sitecategories; + + /** + * Multisite Site Metadata table + * + * @since 3.0.0 + * @var string + */ + public $sitemeta; + + /** + * Format specifiers for DB columns. Columns not listed here default to %s. Initialized during WP load. + * + * Keys are column names, values are format types: 'ID' => '%d' + * + * @since 2.8.0 + * @see wpdb::prepare() + * @see wpdb::insert() + * @see wpdb::update() + * @see wpdb::delete() + * @see wp_set_wpdb_vars() + * @var array + */ + public $field_types = array(); + + /** + * Database table columns charset + * + * @since 2.2.0 + * @var string + */ + public $charset; + + /** + * Database table columns collate + * + * @since 2.2.0 + * @var string + */ + public $collate; + + /** + * Database Username + * + * @since 2.9.0 + * @var string + */ + protected $dbuser; + + /** + * Database Password + * + * @since 3.1.0 + * @var string + */ + protected $dbpassword; + + /** + * Database Name + * + * @since 3.1.0 + * @var string + */ + protected $dbname; + + /** + * Database Host + * + * @since 3.1.0 + * @var string + */ + protected $dbhost; + + /** + * Database Handle + * + * @since 0.71 + * @var string + */ + protected $dbh; + + /** + * A textual description of the last query/get_row/get_var call + * + * @since 3.0.0 + * @var string + */ + public $func_call; + + /** + * Whether MySQL is used as the database engine. + * + * Set in WPDB::db_connect() to true, by default. This is used when checking + * against the required MySQL version for WordPress. Normally, a replacement + * database drop-in (db.php) will skip these checks, but setting this to true + * will force the checks to occur. + * + * @since 3.3.0 + * @var bool + */ + public $is_mysql = null; + + /** + * A list of incompatible SQL modes. + * + * @since 3.9.0 + * @var array + */ + protected $incompatible_modes = array( + 'NO_ZERO_DATE', + 'ONLY_FULL_GROUP_BY', + 'STRICT_TRANS_TABLES', + 'STRICT_ALL_TABLES', + 'TRADITIONAL', + ); + + /** + * Whether to use mysqli over mysql. + * + * @since 3.9.0 + * @var bool + */ + private $use_mysqli = false; + + /** + * Whether we've managed to successfully connect at some point + * + * @since 3.9.0 + * @var bool + */ + private $has_connected = false; + + /** + * Connects to the database server and selects a database + * + * PHP5 style constructor for compatibility with PHP5. Does + * the actual setting up of the class properties and connection + * to the database. + * + * @link https://core.trac.wordpress.org/ticket/3354 + * @since 2.0.8 + * + * @global string $wp_version + * + * @param string $dbuser MySQL database user + * @param string $dbpassword MySQL database password + * @param string $dbname MySQL database name + * @param string $dbhost MySQL database host + */ + public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) { + register_shutdown_function( array( $this, '__destruct' ) ); + + if ( WP_DEBUG && WP_DEBUG_DISPLAY ) { + $this->show_errors(); + } + + // Use ext/mysqli if it exists unless WP_USE_EXT_MYSQL is defined as true + if ( function_exists( 'mysqli_connect' ) ) { + $this->use_mysqli = true; + + if ( defined( 'WP_USE_EXT_MYSQL' ) ) { + $this->use_mysqli = ! WP_USE_EXT_MYSQL; + } + } + + $this->dbuser = $dbuser; + $this->dbpassword = $dbpassword; + $this->dbname = $dbname; + $this->dbhost = $dbhost; + + // wp-config.php creation will manually connect when ready. + if ( defined( 'WP_SETUP_CONFIG' ) ) { + return; + } + + $this->db_connect(); + } + + /** + * PHP5 style destructor and will run when database object is destroyed. + * + * @see wpdb::__construct() + * @since 2.0.8 + * @return true + */ + public function __destruct() { + return true; + } + + /** + * Makes private properties readable for backward compatibility. + * + * @since 3.5.0 + * + * @param string $name The private member to get, and optionally process + * @return mixed The private member + */ + public function __get( $name ) { + if ( 'col_info' === $name ) { + $this->load_col_info(); + } + + return $this->$name; + } + + /** + * Makes private properties settable for backward compatibility. + * + * @since 3.5.0 + * + * @param string $name The private member to set + * @param mixed $value The value to set + */ + public function __set( $name, $value ) { + $protected_members = array( + 'col_meta', + 'table_charset', + 'check_current_query', + ); + if ( in_array( $name, $protected_members, true ) ) { + return; + } + $this->$name = $value; + } + + /** + * Makes private properties check-able for backward compatibility. + * + * @since 3.5.0 + * + * @param string $name The private member to check + * + * @return bool If the member is set or not + */ + public function __isset( $name ) { + return isset( $this->$name ); + } + + /** + * Makes private properties un-settable for backward compatibility. + * + * @since 3.5.0 + * + * @param string $name The private member to unset + */ + public function __unset( $name ) { + unset( $this->$name ); + } + + /** + * Set $this->charset and $this->collate + * + * @since 3.1.0 + */ + public function init_charset() { + $charset = ''; + $collate = ''; + + if ( function_exists( 'is_multisite' ) && is_multisite() ) { + $charset = 'utf8'; + if ( defined( 'DB_COLLATE' ) && DB_COLLATE ) { + $collate = DB_COLLATE; + } else { + $collate = 'utf8_general_ci'; + } + } elseif ( defined( 'DB_COLLATE' ) ) { + $collate = DB_COLLATE; + } + + if ( defined( 'DB_CHARSET' ) ) { + $charset = DB_CHARSET; + } + + $charset_collate = $this->determine_charset( $charset, $collate ); + + $this->charset = $charset_collate['charset']; + $this->collate = $charset_collate['collate']; + } + + /** + * Determines the best charset and collation to use given a charset and collation. + * + * For example, when able, utf8mb4 should be used instead of utf8. + * + * @since 4.6.0 + * + * @param string $charset The character set to check. + * @param string $collate The collation to check. + * @return array The most appropriate character set and collation to use. + */ + public function determine_charset( $charset, $collate ) { + if ( ( $this->use_mysqli && ! ( $this->dbh instanceof mysqli ) ) || empty( $this->dbh ) ) { + return compact( 'charset', 'collate' ); + } + + if ( 'utf8' === $charset && $this->has_cap( 'utf8mb4' ) ) { + $charset = 'utf8mb4'; + } + + if ( 'utf8mb4' === $charset && ! $this->has_cap( 'utf8mb4' ) ) { + $charset = 'utf8'; + $collate = str_replace( 'utf8mb4_', 'utf8_', $collate ); + } + + if ( 'utf8mb4' === $charset ) { + // _general_ is outdated, so we can upgrade it to _unicode_, instead. + if ( ! $collate || 'utf8_general_ci' === $collate ) { + $collate = 'utf8mb4_unicode_ci'; + } else { + $collate = str_replace( 'utf8_', 'utf8mb4_', $collate ); + } + } + + // _unicode_520_ is a better collation, we should use that when it's available. + if ( $this->has_cap( 'utf8mb4_520' ) && 'utf8mb4_unicode_ci' === $collate ) { + $collate = 'utf8mb4_unicode_520_ci'; + } + + return compact( 'charset', 'collate' ); + } + + /** + * Sets the connection's character set. + * + * @since 3.1.0 + * + * @param resource $dbh The resource given by mysql_connect + * @param string $charset Optional. The character set. Default null. + * @param string $collate Optional. The collation. Default null. + */ + public function set_charset( $dbh, $charset = null, $collate = null ) { + if ( ! isset( $charset ) ) { + $charset = $this->charset; + } + if ( ! isset( $collate ) ) { + $collate = $this->collate; + } + if ( $this->has_cap( 'collation' ) && ! empty( $charset ) ) { + $set_charset_succeeded = true; + + if ( $this->use_mysqli ) { + if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) { + $set_charset_succeeded = mysqli_set_charset( $dbh, $charset ); + } + + if ( $set_charset_succeeded ) { + $query = $this->prepare( 'SET NAMES %s', $charset ); + if ( ! empty( $collate ) ) { + $query .= $this->prepare( ' COLLATE %s', $collate ); + } + mysqli_query( $dbh, $query ); + } + } else { + if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset' ) ) { + $set_charset_succeeded = mysql_set_charset( $charset, $dbh ); + } + if ( $set_charset_succeeded ) { + $query = $this->prepare( 'SET NAMES %s', $charset ); + if ( ! empty( $collate ) ) { + $query .= $this->prepare( ' COLLATE %s', $collate ); + } + mysql_query( $query, $dbh ); + } + } + } + } + + /** + * Change the current SQL mode, and ensure its WordPress compatibility. + * + * If no modes are passed, it will ensure the current MySQL server + * modes are compatible. + * + * @since 3.9.0 + * + * @param array $modes Optional. A list of SQL modes to set. + */ + public function set_sql_mode( $modes = array() ) { + if ( empty( $modes ) ) { + if ( $this->use_mysqli ) { + $res = mysqli_query( $this->dbh, 'SELECT @@SESSION.sql_mode' ); + } else { + $res = mysql_query( 'SELECT @@SESSION.sql_mode', $this->dbh ); + } + + if ( empty( $res ) ) { + return; + } + + if ( $this->use_mysqli ) { + $modes_array = mysqli_fetch_array( $res ); + if ( empty( $modes_array[0] ) ) { + return; + } + $modes_str = $modes_array[0]; + } else { + $modes_str = mysql_result( $res, 0 ); + } + + if ( empty( $modes_str ) ) { + return; + } + + $modes = explode( ',', $modes_str ); + } + + $modes = array_change_key_case( $modes, CASE_UPPER ); + + /** + * Filters the list of incompatible SQL modes to exclude. + * + * @since 3.9.0 + * + * @param array $incompatible_modes An array of incompatible modes. + */ + $incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes ); + + foreach ( $modes as $i => $mode ) { + if ( in_array( $mode, $incompatible_modes ) ) { + unset( $modes[ $i ] ); + } + } + + $modes_str = implode( ',', $modes ); + + if ( $this->use_mysqli ) { + mysqli_query( $this->dbh, "SET SESSION sql_mode='$modes_str'" ); + } else { + mysql_query( "SET SESSION sql_mode='$modes_str'", $this->dbh ); + } + } + + /** + * Sets the table prefix for the WordPress tables. + * + * @since 2.5.0 + * + * @param string $prefix Alphanumeric name for the new prefix. + * @param bool $set_table_names Optional. Whether the table names, e.g. wpdb::$posts, should be updated or not. + * @return string|WP_Error Old prefix or WP_Error on error + */ + public function set_prefix( $prefix, $set_table_names = true ) { + + if ( preg_match( '|[^a-z0-9_]|i', $prefix ) ) { + return new WP_Error( 'invalid_db_prefix', 'Invalid database prefix' ); + } + + $old_prefix = is_multisite() ? '' : $prefix; + + if ( isset( $this->base_prefix ) ) { + $old_prefix = $this->base_prefix; + } + + $this->base_prefix = $prefix; + + if ( $set_table_names ) { + foreach ( $this->tables( 'global' ) as $table => $prefixed_table ) { + $this->$table = $prefixed_table; + } + + if ( is_multisite() && empty( $this->blogid ) ) { + return $old_prefix; + } + + $this->prefix = $this->get_blog_prefix(); + + foreach ( $this->tables( 'blog' ) as $table => $prefixed_table ) { + $this->$table = $prefixed_table; + } + + foreach ( $this->tables( 'old' ) as $table => $prefixed_table ) { + $this->$table = $prefixed_table; + } + } + return $old_prefix; + } + + /** + * Sets blog id. + * + * @since 3.0.0 + * + * @param int $blog_id + * @param int $network_id Optional. + * @return int previous blog id + */ + public function set_blog_id( $blog_id, $network_id = 0 ) { + if ( ! empty( $network_id ) ) { + $this->siteid = $network_id; + } + + $old_blog_id = $this->blogid; + $this->blogid = $blog_id; + + $this->prefix = $this->get_blog_prefix(); + + foreach ( $this->tables( 'blog' ) as $table => $prefixed_table ) { + $this->$table = $prefixed_table; + } + + foreach ( $this->tables( 'old' ) as $table => $prefixed_table ) { + $this->$table = $prefixed_table; + } + + return $old_blog_id; + } + + /** + * Gets blog prefix. + * + * @since 3.0.0 + * @param int $blog_id Optional. + * @return string Blog prefix. + */ + public function get_blog_prefix( $blog_id = null ) { + if ( is_multisite() ) { + if ( null === $blog_id ) { + $blog_id = $this->blogid; + } + $blog_id = (int) $blog_id; + if ( defined( 'MULTISITE' ) && ( 0 == $blog_id || 1 == $blog_id ) ) { + return $this->base_prefix; + } else { + return $this->base_prefix . $blog_id . '_'; + } + } else { + return $this->base_prefix; + } + } + + /** + * Returns an array of WordPress tables. + * + * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to + * override the WordPress users and usermeta tables that would otherwise + * be determined by the prefix. + * + * The scope argument can take one of the following: + * + * 'all' - returns 'all' and 'global' tables. No old tables are returned. + * 'blog' - returns the blog-level tables for the queried blog. + * 'global' - returns the global tables for the installation, returning multisite tables only if running multisite. + * 'ms_global' - returns the multisite global tables, regardless if current installation is multisite. + * 'old' - returns tables which are deprecated. + * + * @since 3.0.0 + * @uses wpdb::$tables + * @uses wpdb::$old_tables + * @uses wpdb::$global_tables + * @uses wpdb::$ms_global_tables + * + * @param string $scope Optional. Can be all, global, ms_global, blog, or old tables. Defaults to all. + * @param bool $prefix Optional. Whether to include table prefixes. Default true. If blog + * prefix is requested, then the custom users and usermeta tables will be mapped. + * @param int $blog_id Optional. The blog_id to prefix. Defaults to wpdb::$blogid. Used only when prefix is requested. + * @return array Table names. When a prefix is requested, the key is the unprefixed table name. + */ + public function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) { + switch ( $scope ) { + case 'all': + $tables = array_merge( $this->global_tables, $this->tables ); + if ( is_multisite() ) { + $tables = array_merge( $tables, $this->ms_global_tables ); + } + break; + case 'blog': + $tables = $this->tables; + break; + case 'global': + $tables = $this->global_tables; + if ( is_multisite() ) { + $tables = array_merge( $tables, $this->ms_global_tables ); + } + break; + case 'ms_global': + $tables = $this->ms_global_tables; + break; + case 'old': + $tables = $this->old_tables; + break; + default: + return array(); + } + + if ( $prefix ) { + if ( ! $blog_id ) { + $blog_id = $this->blogid; + } + $blog_prefix = $this->get_blog_prefix( $blog_id ); + $base_prefix = $this->base_prefix; + $global_tables = array_merge( $this->global_tables, $this->ms_global_tables ); + foreach ( $tables as $k => $table ) { + if ( in_array( $table, $global_tables ) ) { + $tables[ $table ] = $base_prefix . $table; + } else { + $tables[ $table ] = $blog_prefix . $table; + } + unset( $tables[ $k ] ); + } + + if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) ) { + $tables['users'] = CUSTOM_USER_TABLE; + } + + if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) ) { + $tables['usermeta'] = CUSTOM_USER_META_TABLE; + } + } + + return $tables; + } + + /** + * Selects a database using the current database connection. + * + * The database name will be changed based on the current database + * connection. On failure, the execution will bail and display an DB error. + * + * @since 0.71 + * + * @param string $db MySQL database name + * @param resource|null $dbh Optional link identifier. + */ + public function select( $db, $dbh = null ) { + if ( is_null( $dbh ) ) { + $dbh = $this->dbh; + } + + if ( $this->use_mysqli ) { + $success = mysqli_select_db( $dbh, $db ); + } else { + $success = mysql_select_db( $db, $dbh ); + } + if ( ! $success ) { + $this->ready = false; + if ( ! did_action( 'template_redirect' ) ) { + wp_load_translations_early(); + + $message = '<h1>' . __( 'Can’t select database' ) . "</h1>\n"; + + $message .= '<p>' . sprintf( + /* translators: %s: Database name. */ + __( 'We were able to connect to the database server (which means your username and password is okay) but not able to select the %s database.' ), + '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>' + ) . "</p>\n"; + + $message .= "<ul>\n"; + $message .= '<li>' . __( 'Are you sure it exists?' ) . "</li>\n"; + + $message .= '<li>' . sprintf( + /* translators: 1: Database user, 2: Database name. */ + __( 'Does the user %1$s have permission to use the %2$s database?' ), + '<code>' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '</code>', + '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>' + ) . "</li>\n"; + + $message .= '<li>' . sprintf( + /* translators: %s: Database name. */ + __( 'On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?' ), + htmlspecialchars( $db, ENT_QUOTES ) + ) . "</li>\n"; + + $message .= "</ul>\n"; + + $message .= '<p>' . sprintf( + /* translators: %s: Support forums URL. */ + __( 'If you don’t know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="%s">WordPress Support Forums</a>.' ), + __( 'https://wordpress.org/support/forums/' ) + ) . "</p>\n"; + + $this->bail( $message, 'db_select_fail' ); + } + } + } + + /** + * Do not use, deprecated. + * + * Use esc_sql() or wpdb::prepare() instead. + * + * @since 2.8.0 + * @deprecated 3.6.0 Use wpdb::prepare() + * @see wpdb::prepare + * @see esc_sql() + * + * @param string $string + * @return string + */ + function _weak_escape( $string ) { + if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) { + _deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' ); + } + return addslashes( $string ); + } + + /** + * Real escape, using mysqli_real_escape_string() or mysql_real_escape_string() + * + * @see mysqli_real_escape_string() + * @see mysql_real_escape_string() + * @since 2.8.0 + * + * @param string $string to escape + * @return string escaped + */ + function _real_escape( $string ) { + if ( $this->dbh ) { + if ( $this->use_mysqli ) { + $escaped = mysqli_real_escape_string( $this->dbh, $string ); + } else { + $escaped = mysql_real_escape_string( $string, $this->dbh ); + } + } else { + $class = get_class( $this ); + if ( function_exists( '__' ) ) { + /* translators: %s: Database access abstraction class, usually wpdb or a class extending wpdb. */ + _doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), '3.6.0' ); + } else { + _doing_it_wrong( $class, sprintf( '%s must set a database connection for use with escaping.', $class ), '3.6.0' ); + } + $escaped = addslashes( $string ); + } + + return $this->add_placeholder_escape( $escaped ); + } + + /** + * Escape data. Works on arrays. + * + * @uses wpdb::_real_escape() + * @since 2.8.0 + * + * @param string|array $data + * @return string|array escaped + */ + public function _escape( $data ) { + if ( is_array( $data ) ) { + foreach ( $data as $k => $v ) { + if ( is_array( $v ) ) { + $data[ $k ] = $this->_escape( $v ); + } else { + $data[ $k ] = $this->_real_escape( $v ); + } + } + } else { + $data = $this->_real_escape( $data ); + } + + return $data; + } + + /** + * Do not use, deprecated. + * + * Use esc_sql() or wpdb::prepare() instead. + * + * @since 0.71 + * @deprecated 3.6.0 Use wpdb::prepare() + * @see wpdb::prepare() + * @see esc_sql() + * + * @param mixed $data + * @return mixed + */ + public function escape( $data ) { + if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) { + _deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' ); + } + if ( is_array( $data ) ) { + foreach ( $data as $k => $v ) { + if ( is_array( $v ) ) { + $data[ $k ] = $this->escape( $v, 'recursive' ); + } else { + $data[ $k ] = $this->_weak_escape( $v, 'internal' ); + } + } + } else { + $data = $this->_weak_escape( $data, 'internal' ); + } + + return $data; + } + + /** + * Escapes content by reference for insertion into the database, for security + * + * @uses wpdb::_real_escape() + * + * @since 2.3.0 + * + * @param string $string to escape + */ + public function escape_by_ref( &$string ) { + if ( ! is_float( $string ) ) { + $string = $this->_real_escape( $string ); + } + } + + /** + * Prepares a SQL query for safe execution. Uses sprintf()-like syntax. + * + * The following placeholders can be used in the query string: + * %d (integer) + * %f (float) + * %s (string) + * + * All placeholders MUST be left unquoted in the query string. A corresponding argument + * MUST be passed for each placeholder. + * + * For compatibility with old behavior, numbered or formatted string placeholders (eg, %1$s, %5s) + * will not have quotes added by this function, so should be passed with appropriate quotes around + * them for your usage. + * + * Literal percentage signs (%) in the query string must be written as %%. Percentage wildcards (for example, + * to use in LIKE syntax) must be passed via a substitution argument containing the complete LIKE string, these + * cannot be inserted directly in the query string. Also see wpdb::esc_like(). + * + * Arguments may be passed as individual arguments to the method, or as a single array containing + * all arguments. A combination of the two is not supported. + * + * Examples: + * $wpdb->prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d OR `other_field` LIKE %s", array( 'foo', 1337, '%bar' ) ); + * $wpdb->prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' ); + * + * @link https://secure.php.net/sprintf Description of syntax. + * @since 2.3.0 + * @since 5.3.0 Formalized the existing and already documented `...$args` parameter + * by updating the function signature. The second parameter was changed + * from `$args` to `...$args`. + * + * @param string $query Query statement with sprintf()-like placeholders + * @param array|mixed $args The array of variables to substitute into the query's placeholders + * if being called with an array of arguments, or the first variable + * to substitute into the query's placeholders if being called with + * individual arguments. + * @param mixed ...$args Further variables to substitute into the query's placeholders + * if being called with individual arguments. + * @return string|void Sanitized query string, if there is a query to prepare. + */ + public function prepare( $query, ...$args ) { + if ( is_null( $query ) ) { + return; + } + + // This is not meant to be foolproof -- but it will catch obviously incorrect usage. + if ( strpos( $query, '%' ) === false ) { + wp_load_translations_early(); + _doing_it_wrong( + 'wpdb::prepare', + sprintf( + /* translators: %s: wpdb::prepare() */ + __( 'The query argument of %s must have a placeholder.' ), + 'wpdb::prepare()' + ), + '3.9.0' + ); + } + + // If args were passed as an array (as in vsprintf), move them up. + $passed_as_array = false; + if ( is_array( $args[0] ) && count( $args ) == 1 ) { + $passed_as_array = true; + $args = $args[0]; + } + + foreach ( $args as $arg ) { + if ( ! is_scalar( $arg ) && ! is_null( $arg ) ) { + wp_load_translations_early(); + _doing_it_wrong( + 'wpdb::prepare', + sprintf( + /* translators: %s: Value type. */ + __( 'Unsupported value type (%s).' ), + gettype( $arg ) + ), + '4.8.2' + ); + } + } + + /* + * Specify the formatting allowed in a placeholder. The following are allowed: + * + * - Sign specifier. eg, $+d + * - Numbered placeholders. eg, %1$s + * - Padding specifier, including custom padding characters. eg, %05s, %'#5s + * - Alignment specifier. eg, %05-s + * - Precision specifier. eg, %.2f + */ + $allowed_format = '(?:[1-9][0-9]*[$])?[-+0-9]*(?: |0|\'.)?[-+0-9]*(?:\.[0-9]+)?'; + + /* + * If a %s placeholder already has quotes around it, removing the existing quotes and re-inserting them + * ensures the quotes are consistent. + * + * For backward compatibility, this is only applied to %s, and not to placeholders like %1$s, which are frequently + * used in the middle of longer strings, or as table name placeholders. + */ + $query = str_replace( "'%s'", '%s', $query ); // Strip any existing single quotes. + $query = str_replace( '"%s"', '%s', $query ); // Strip any existing double quotes. + $query = preg_replace( '/(?<!%)%s/', "'%s'", $query ); // Quote the strings, avoiding escaped strings like %%s. + + $query = preg_replace( "/(?<!%)(%($allowed_format)?f)/", '%\\2F', $query ); // Force floats to be locale unaware. + + $query = preg_replace( "/%(?:%|$|(?!($allowed_format)?[sdF]))/", '%%\\1', $query ); // Escape any unescaped percents. + + // Count the number of valid placeholders in the query. + $placeholders = preg_match_all( "/(^|[^%]|(%%)+)%($allowed_format)?[sdF]/", $query, $matches ); + + if ( count( $args ) !== $placeholders ) { + if ( 1 === $placeholders && $passed_as_array ) { + // If the passed query only expected one argument, but the wrong number of arguments were sent as an array, bail. + wp_load_translations_early(); + _doing_it_wrong( + 'wpdb::prepare', + __( 'The query only expected one placeholder, but an array of multiple placeholders was sent.' ), + '4.9.0' + ); + + return; + } else { + /* + * If we don't have the right number of placeholders, but they were passed as individual arguments, + * or we were expecting multiple arguments in an array, throw a warning. + */ + wp_load_translations_early(); + _doing_it_wrong( + 'wpdb::prepare', + sprintf( + /* translators: 1: Number of placeholders, 2: Number of arguments passed. */ + __( 'The query does not contain the correct number of placeholders (%1$d) for the number of arguments passed (%2$d).' ), + $placeholders, + count( $args ) + ), + '4.8.3' + ); + } + } + + array_walk( $args, array( $this, 'escape_by_ref' ) ); + $query = vsprintf( $query, $args ); + + return $this->add_placeholder_escape( $query ); + } + + /** + * First half of escaping for LIKE special characters % and _ before preparing for MySQL. + * + * Use this only before wpdb::prepare() or esc_sql(). Reversing the order is very bad for security. + * + * Example Prepared Statement: + * + * $wild = '%'; + * $find = 'only 43% of planets'; + * $like = $wild . $wpdb->esc_like( $find ) . $wild; + * $sql = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_content LIKE %s", $like ); + * + * Example Escape Chain: + * + * $sql = esc_sql( $wpdb->esc_like( $input ) ); + * + * @since 4.0.0 + * + * @param string $text The raw text to be escaped. The input typed by the user should have no + * extra or deleted slashes. + * @return string Text in the form of a LIKE phrase. The output is not SQL safe. Call $wpdb::prepare() + * or real_escape next. + */ + public function esc_like( $text ) { + return addcslashes( $text, '_%\\' ); + } + + /** + * Print SQL/DB error. + * + * @since 0.71 + * @global array $EZSQL_ERROR Stores error information of query and error string + * + * @param string $str The error to display + * @return false|void False if the showing of errors is disabled. + */ + public function print_error( $str = '' ) { + global $EZSQL_ERROR; + + if ( ! $str ) { + if ( $this->use_mysqli ) { + $str = mysqli_error( $this->dbh ); + } else { + $str = mysql_error( $this->dbh ); + } + } + $EZSQL_ERROR[] = array( + 'query' => $this->last_query, + 'error_str' => $str, + ); + + if ( $this->suppress_errors ) { + return false; + } + + wp_load_translations_early(); + + $caller = $this->get_caller(); + if ( $caller ) { + /* translators: 1: Database error message, 2: SQL query, 3: Name of the calling function. */ + $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller ); + } else { + /* translators: 1: Database error message, 2: SQL query. */ + $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s' ), $str, $this->last_query ); + } + + error_log( $error_str ); + + // Are we showing errors? + if ( ! $this->show_errors ) { + return false; + } + + // If there is an error then take note of it + if ( is_multisite() ) { + $msg = sprintf( + "%s [%s]\n%s\n", + __( 'WordPress database error:' ), + $str, + $this->last_query + ); + + if ( defined( 'ERRORLOGFILE' ) ) { + error_log( $msg, 3, ERRORLOGFILE ); + } + if ( defined( 'DIEONDBERROR' ) ) { + wp_die( $msg ); + } + } else { + $str = htmlspecialchars( $str, ENT_QUOTES ); + $query = htmlspecialchars( $this->last_query, ENT_QUOTES ); + + printf( + '<div id="error"><p class="wpdberror"><strong>%s</strong> [%s]<br /><code>%s</code></p></div>', + __( 'WordPress database error:' ), + $str, + $query + ); + } + } + + /** + * Enables showing of database errors. + * + * This function should be used only to enable showing of errors. + * wpdb::hide_errors() should be used instead for hiding of errors. However, + * this function can be used to enable and disable showing of database + * errors. + * + * @since 0.71 + * @see wpdb::hide_errors() + * + * @param bool $show Whether to show or hide errors + * @return bool Old value for showing errors. + */ + public function show_errors( $show = true ) { + $errors = $this->show_errors; + $this->show_errors = $show; + return $errors; + } + + /** + * Disables showing of database errors. + * + * By default database errors are not shown. + * + * @since 0.71 + * @see wpdb::show_errors() + * + * @return bool Whether showing of errors was active + */ + public function hide_errors() { + $show = $this->show_errors; + $this->show_errors = false; + return $show; + } + + /** + * Whether to suppress database errors. + * + * By default database errors are suppressed, with a simple + * call to this function they can be enabled. + * + * @since 2.5.0 + * @see wpdb::hide_errors() + * @param bool $suppress Optional. New value. Defaults to true. + * @return bool Old value + */ + public function suppress_errors( $suppress = true ) { + $errors = $this->suppress_errors; + $this->suppress_errors = (bool) $suppress; + return $errors; + } + + /** + * Kill cached query results. + * + * @since 0.71 + */ + public function flush() { + $this->last_result = array(); + $this->col_info = null; + $this->last_query = null; + $this->rows_affected = 0; + $this->num_rows = 0; + $this->last_error = ''; + + if ( $this->use_mysqli && $this->result instanceof mysqli_result ) { + mysqli_free_result( $this->result ); + $this->result = null; + + // Sanity check before using the handle + if ( empty( $this->dbh ) || ! ( $this->dbh instanceof mysqli ) ) { + return; + } + + // Clear out any results from a multi-query + while ( mysqli_more_results( $this->dbh ) ) { + mysqli_next_result( $this->dbh ); + } + } elseif ( is_resource( $this->result ) ) { + mysql_free_result( $this->result ); + } + } + + /** + * Connect to and select database. + * + * If $allow_bail is false, the lack of database connection will need + * to be handled manually. + * + * @since 3.0.0 + * @since 3.9.0 $allow_bail parameter added. + * + * @param bool $allow_bail Optional. Allows the function to bail. Default true. + * @return bool True with a successful connection, false on failure. + */ + public function db_connect( $allow_bail = true ) { + $this->is_mysql = true; + + /* + * Deprecated in 3.9+ when using MySQLi. No equivalent + * $new_link parameter exists for mysqli_* functions. + */ + $new_link = defined( 'MYSQL_NEW_LINK' ) ? MYSQL_NEW_LINK : true; + $client_flags = defined( 'MYSQL_CLIENT_FLAGS' ) ? MYSQL_CLIENT_FLAGS : 0; + + if ( $this->use_mysqli ) { + $this->dbh = mysqli_init(); + + $host = $this->dbhost; + $port = null; + $socket = null; + $is_ipv6 = false; + + $host_data = $this->parse_db_host( $this->dbhost ); + if ( $host_data ) { + list( $host, $port, $socket, $is_ipv6 ) = $host_data; + } + + /* + * If using the `mysqlnd` library, the IPv6 address needs to be + * enclosed in square brackets, whereas it doesn't while using the + * `libmysqlclient` library. + * @see https://bugs.php.net/bug.php?id=67563 + */ + if ( $is_ipv6 && extension_loaded( 'mysqlnd' ) ) { + $host = "[$host]"; + } + + if ( WP_DEBUG ) { + mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags ); + } else { + // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged + @mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags ); + } + + if ( $this->dbh->connect_errno ) { + $this->dbh = null; + + /* + * It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if: + * - We haven't previously connected, and + * - WP_USE_EXT_MYSQL isn't set to false, and + * - ext/mysql is loaded. + */ + $attempt_fallback = true; + + if ( $this->has_connected ) { + $attempt_fallback = false; + } elseif ( defined( 'WP_USE_EXT_MYSQL' ) && ! WP_USE_EXT_MYSQL ) { + $attempt_fallback = false; + } elseif ( ! function_exists( 'mysql_connect' ) ) { + $attempt_fallback = false; + } + + if ( $attempt_fallback ) { + $this->use_mysqli = false; + return $this->db_connect( $allow_bail ); + } + } + } else { + if ( WP_DEBUG ) { + $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags ); + } else { + // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged + $this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags ); + } + } + + if ( ! $this->dbh && $allow_bail ) { + wp_load_translations_early(); + + // Load custom DB error template, if present. + if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) { + require_once( WP_CONTENT_DIR . '/db-error.php' ); + die(); + } + + $message = '<h1>' . __( 'Error establishing a database connection' ) . "</h1>\n"; + + $message .= '<p>' . sprintf( + /* translators: 1: wp-config.php, 2: Database host. */ + __( 'This either means that the username and password information in your %1$s file is incorrect or we can’t contact the database server at %2$s. This could mean your host’s database server is down.' ), + '<code>wp-config.php</code>', + '<code>' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . '</code>' + ) . "</p>\n"; + + $message .= "<ul>\n"; + $message .= '<li>' . __( 'Are you sure you have the correct username and password?' ) . "</li>\n"; + $message .= '<li>' . __( 'Are you sure you have typed the correct hostname?' ) . "</li>\n"; + $message .= '<li>' . __( 'Are you sure the database server is running?' ) . "</li>\n"; + $message .= "</ul>\n"; + + $message .= '<p>' . sprintf( + /* translators: %s: Support forums URL. */ + __( 'If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href="%s">WordPress Support Forums</a>.' ), + __( 'https://wordpress.org/support/forums/' ) + ) . "</p>\n"; + + $this->bail( $message, 'db_connect_fail' ); + + return false; + } elseif ( $this->dbh ) { + if ( ! $this->has_connected ) { + $this->init_charset(); + } + + $this->has_connected = true; + + $this->set_charset( $this->dbh ); + + $this->ready = true; + $this->set_sql_mode(); + $this->select( $this->dbname, $this->dbh ); + + return true; + } + + return false; + } + + /** + * Parse the DB_HOST setting to interpret it for mysqli_real_connect. + * + * mysqli_real_connect doesn't support the host param including a port or + * socket like mysql_connect does. This duplicates how mysql_connect detects + * a port and/or socket file. + * + * @since 4.9.0 + * + * @param string $host The DB_HOST setting to parse. + * @return array|bool Array containing the host, the port, the socket and whether + * it is an IPv6 address, in that order. If $host couldn't be parsed, + * returns false. + */ + public function parse_db_host( $host ) { + $port = null; + $socket = null; + $is_ipv6 = false; + + // First peel off the socket parameter from the right, if it exists. + $socket_pos = strpos( $host, ':/' ); + if ( $socket_pos !== false ) { + $socket = substr( $host, $socket_pos + 1 ); + $host = substr( $host, 0, $socket_pos ); + } + + // We need to check for an IPv6 address first. + // An IPv6 address will always contain at least two colons. + if ( substr_count( $host, ':' ) > 1 ) { + $pattern = '#^(?:\[)?(?P<host>[0-9a-fA-F:]+)(?:\]:(?P<port>[\d]+))?#'; + $is_ipv6 = true; + } else { + // We seem to be dealing with an IPv4 address. + $pattern = '#^(?P<host>[^:/]*)(?::(?P<port>[\d]+))?#'; + } + + $matches = array(); + $result = preg_match( $pattern, $host, $matches ); + + if ( 1 !== $result ) { + // Couldn't parse the address, bail. + return false; + } + + $host = ''; + foreach ( array( 'host', 'port' ) as $component ) { + if ( ! empty( $matches[ $component ] ) ) { + $$component = $matches[ $component ]; + } + } + + return array( $host, $port, $socket, $is_ipv6 ); + } + + /** + * Checks that the connection to the database is still up. If not, try to reconnect. + * + * If this function is unable to reconnect, it will forcibly die, or if after the + * the {@see 'template_redirect'} hook has been fired, return false instead. + * + * If $allow_bail is false, the lack of database connection will need + * to be handled manually. + * + * @since 3.9.0 + * + * @param bool $allow_bail Optional. Allows the function to bail. Default true. + * @return bool|void True if the connection is up. + */ + public function check_connection( $allow_bail = true ) { + if ( $this->use_mysqli ) { + if ( ! empty( $this->dbh ) && mysqli_ping( $this->dbh ) ) { + return true; + } + } else { + if ( ! empty( $this->dbh ) && mysql_ping( $this->dbh ) ) { + return true; + } + } + + $error_reporting = false; + + // Disable warnings, as we don't want to see a multitude of "unable to connect" messages + if ( WP_DEBUG ) { + $error_reporting = error_reporting(); + error_reporting( $error_reporting & ~E_WARNING ); + } + + for ( $tries = 1; $tries <= $this->reconnect_retries; $tries++ ) { + // On the last try, re-enable warnings. We want to see a single instance of the + // "unable to connect" message on the bail() screen, if it appears. + if ( $this->reconnect_retries === $tries && WP_DEBUG ) { + error_reporting( $error_reporting ); + } + + if ( $this->db_connect( false ) ) { + if ( $error_reporting ) { + error_reporting( $error_reporting ); + } + + return true; + } + + sleep( 1 ); + } + + // If template_redirect has already happened, it's too late for wp_die()/dead_db(). + // Let's just return and hope for the best. + if ( did_action( 'template_redirect' ) ) { + return false; + } + + if ( ! $allow_bail ) { + return false; + } + + wp_load_translations_early(); + + $message = '<h1>' . __( 'Error reconnecting to the database' ) . "</h1>\n"; + + $message .= '<p>' . sprintf( + /* translators: %s: Database host. */ + __( 'This means that we lost contact with the database server at %s. This could mean your host’s database server is down.' ), + '<code>' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . '</code>' + ) . "</p>\n"; + + $message .= "<ul>\n"; + $message .= '<li>' . __( 'Are you sure the database server is running?' ) . "</li>\n"; + $message .= '<li>' . __( 'Are you sure the database server is not under particularly heavy load?' ) . "</li>\n"; + $message .= "</ul>\n"; + + $message .= '<p>' . sprintf( + /* translators: %s: Support forums URL. */ + __( 'If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href="%s">WordPress Support Forums</a>.' ), + __( 'https://wordpress.org/support/forums/' ) + ) . "</p>\n"; + + // We weren't able to reconnect, so we better bail. + $this->bail( $message, 'db_connect_fail' ); + + // Call dead_db() if bail didn't die, because this database is no more. It has ceased to be (at least temporarily). + dead_db(); + } + + /** + * Perform a MySQL database query, using current database connection. + * + * More information can be found on the codex page. + * + * @since 0.71 + * + * @param string $query Database query + * @return int|bool Boolean true for CREATE, ALTER, TRUNCATE and DROP queries. Number of rows + * affected/selected for all other queries. Boolean false on error. + */ + public function query( $query ) { + if ( ! $this->ready ) { + $this->check_current_query = true; + return false; + } + + /** + * Filters the database query. + * + * Some queries are made before the plugins have been loaded, + * and thus cannot be filtered with this method. + * + * @since 2.1.0 + * + * @param string $query Database query. + */ + $query = apply_filters( 'query', $query ); + + $this->flush(); + + // Log how the function was called + $this->func_call = "\$db->query(\"$query\")"; + + // If we're writing to the database, make sure the query will write safely. + if ( $this->check_current_query && ! $this->check_ascii( $query ) ) { + $stripped_query = $this->strip_invalid_text_from_query( $query ); + // strip_invalid_text_from_query() can perform queries, so we need + // to flush again, just to make sure everything is clear. + $this->flush(); + if ( $stripped_query !== $query ) { + $this->insert_id = 0; + return false; + } + } + + $this->check_current_query = true; + + // Keep track of the last query for debug. + $this->last_query = $query; + + $this->_do_query( $query ); + + // MySQL server has gone away, try to reconnect. + $mysql_errno = 0; + if ( ! empty( $this->dbh ) ) { + if ( $this->use_mysqli ) { + if ( $this->dbh instanceof mysqli ) { + $mysql_errno = mysqli_errno( $this->dbh ); + } else { + // $dbh is defined, but isn't a real connection. + // Something has gone horribly wrong, let's try a reconnect. + $mysql_errno = 2006; + } + } else { + if ( is_resource( $this->dbh ) ) { + $mysql_errno = mysql_errno( $this->dbh ); + } else { + $mysql_errno = 2006; + } + } + } + + if ( empty( $this->dbh ) || 2006 == $mysql_errno ) { + if ( $this->check_connection() ) { + $this->_do_query( $query ); + } else { + $this->insert_id = 0; + return false; + } + } + + // If there is an error then take note of it. + if ( $this->use_mysqli ) { + if ( $this->dbh instanceof mysqli ) { + $this->last_error = mysqli_error( $this->dbh ); + } else { + $this->last_error = __( 'Unable to retrieve the error message from MySQL' ); + } + } else { + if ( is_resource( $this->dbh ) ) { + $this->last_error = mysql_error( $this->dbh ); + } else { + $this->last_error = __( 'Unable to retrieve the error message from MySQL' ); + } + } + + if ( $this->last_error ) { + // Clear insert_id on a subsequent failed insert. + if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) ) { + $this->insert_id = 0; + } + + $this->print_error(); + return false; + } + + if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) { + $return_val = $this->result; + } elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) { + if ( $this->use_mysqli ) { + $this->rows_affected = mysqli_affected_rows( $this->dbh ); + } else { + $this->rows_affected = mysql_affected_rows( $this->dbh ); + } + // Take note of the insert_id + if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) { + if ( $this->use_mysqli ) { + $this->insert_id = mysqli_insert_id( $this->dbh ); + } else { + $this->insert_id = mysql_insert_id( $this->dbh ); + } + } + // Return number of rows affected + $return_val = $this->rows_affected; + } else { + $num_rows = 0; + if ( $this->use_mysqli && $this->result instanceof mysqli_result ) { + while ( $row = mysqli_fetch_object( $this->result ) ) { + $this->last_result[ $num_rows ] = $row; + $num_rows++; + } + } elseif ( is_resource( $this->result ) ) { + while ( $row = mysql_fetch_object( $this->result ) ) { + $this->last_result[ $num_rows ] = $row; + $num_rows++; + } + } + + // Log number of rows the query returned + // and return number of rows selected + $this->num_rows = $num_rows; + $return_val = $num_rows; + } + + return $return_val; + } + + /** + * Internal function to perform the mysql_query() call. + * + * @since 3.9.0 + * + * @see wpdb::query() + * + * @param string $query The query to run. + */ + private function _do_query( $query ) { + if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { + $this->timer_start(); + } + + if ( ! empty( $this->dbh ) && $this->use_mysqli ) { + $this->result = mysqli_query( $this->dbh, $query ); + } elseif ( ! empty( $this->dbh ) ) { + $this->result = mysql_query( $query, $this->dbh ); + } + $this->num_queries++; + + if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { + $this->log_query( + $query, + $this->timer_stop(), + $this->get_caller(), + $this->time_start, + array() + ); + } + } + + /** + * Logs query data. + * + * @since 5.3.0 + * + * @param string $query The query's SQL. + * @param float $query_time Total time spent on the query, in seconds. + * @param string $query_callstack Comma separated list of the calling functions. + * @param float $query_start Unix timestamp of the time at the start of the query. + * @param array $query_data Custom query data. + * } + */ + public function log_query( $query, $query_time, $query_callstack, $query_start, $query_data ) { + /** + * Filters the custom query data being logged. + * + * Caution should be used when modifying any of this data, it is recommended that any additional + * information you need to store about a query be added as a new associative entry to the fourth + * element $query_data. + * + * @since 5.3.0 + * + * @param array $query_data Custom query data. + * @param string $query The query's SQL. + * @param float $query_time Total time spent on the query, in seconds. + * @param string $query_callstack Comma separated list of the calling functions. + * @param float $query_start Unix timestamp of the time at the start of the query. + */ + $query_data = apply_filters( 'log_query_custom_data', $query_data, $query, $query_time, $query_callstack, $query_start ); + + $this->queries[] = array( + $query, + $query_time, + $query_callstack, + $query_start, + $query_data, + ); + } + + /** + * Generates and returns a placeholder escape string for use in queries returned by ::prepare(). + * + * @since 4.8.3 + * + * @return string String to escape placeholders. + */ + public function placeholder_escape() { + static $placeholder; + + if ( ! $placeholder ) { + // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. + $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; + // Old WP installs may not have AUTH_SALT defined. + $salt = defined( 'AUTH_SALT' ) && AUTH_SALT ? AUTH_SALT : (string) rand(); + + $placeholder = '{' . hash_hmac( $algo, uniqid( $salt, true ), $salt ) . '}'; + } + + /* + * Add the filter to remove the placeholder escaper. Uses priority 0, so that anything + * else attached to this filter will receive the query with the placeholder string removed. + */ + if ( false === has_filter( 'query', array( $this, 'remove_placeholder_escape' ) ) ) { + add_filter( 'query', array( $this, 'remove_placeholder_escape' ), 0 ); + } + + return $placeholder; + } + + /** + * Adds a placeholder escape string, to escape anything that resembles a printf() placeholder. + * + * @since 4.8.3 + * + * @param string $query The query to escape. + * @return string The query with the placeholder escape string inserted where necessary. + */ + public function add_placeholder_escape( $query ) { + /* + * To prevent returning anything that even vaguely resembles a placeholder, + * we clobber every % we can find. + */ + return str_replace( '%', $this->placeholder_escape(), $query ); + } + + /** + * Removes the placeholder escape strings from a query. + * + * @since 4.8.3 + * + * @param string $query The query from which the placeholder will be removed. + * @return string The query with the placeholder removed. + */ + public function remove_placeholder_escape( $query ) { + return str_replace( $this->placeholder_escape(), '%', $query ); + } + + /** + * Insert a row into a table. + * + * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) + * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) + * + * @since 2.5.0 + * @see wpdb::prepare() + * @see wpdb::$field_types + * @see wp_set_wpdb_vars() + * + * @param string $table Table name + * @param array $data Data to insert (in column => value pairs). + * Both $data columns and $data values should be "raw" (neither should be SQL escaped). + * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. + * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. + * If string, that format will be used for all of the values in $data. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types. + * @return int|false The number of rows inserted, or false on error. + */ + public function insert( $table, $data, $format = null ) { + return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' ); + } + + /** + * Replace a row into a table. + * + * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) + * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) + * + * @since 3.0.0 + * @see wpdb::prepare() + * @see wpdb::$field_types + * @see wp_set_wpdb_vars() + * + * @param string $table Table name + * @param array $data Data to insert (in column => value pairs). + * Both $data columns and $data values should be "raw" (neither should be SQL escaped). + * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. + * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. + * If string, that format will be used for all of the values in $data. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types. + * @return int|false The number of rows affected, or false on error. + */ + public function replace( $table, $data, $format = null ) { + return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' ); + } + + /** + * Helper function for insert and replace. + * + * Runs an insert or replace query based on $type argument. + * + * @since 3.0.0 + * @see wpdb::prepare() + * @see wpdb::$field_types + * @see wp_set_wpdb_vars() + * + * @param string $table Table name + * @param array $data Data to insert (in column => value pairs). + * Both $data columns and $data values should be "raw" (neither should be SQL escaped). + * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. + * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data. + * If string, that format will be used for all of the values in $data. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types. + * @param string $type Optional. What type of operation is this? INSERT or REPLACE. Defaults to INSERT. + * @return int|false The number of rows affected, or false on error. + */ + function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) { + $this->insert_id = 0; + + if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) ) { + return false; + } + + $data = $this->process_fields( $table, $data, $format ); + if ( false === $data ) { + return false; + } + + $formats = array(); + $values = array(); + foreach ( $data as $value ) { + if ( is_null( $value['value'] ) ) { + $formats[] = 'NULL'; + continue; + } + + $formats[] = $value['format']; + $values[] = $value['value']; + } + + $fields = '`' . implode( '`, `', array_keys( $data ) ) . '`'; + $formats = implode( ', ', $formats ); + + $sql = "$type INTO `$table` ($fields) VALUES ($formats)"; + + $this->check_current_query = false; + return $this->query( $this->prepare( $sql, $values ) ); + } + + /** + * Update a row in the table + * + * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) ) + * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) ) + * + * @since 2.5.0 + * @see wpdb::prepare() + * @see wpdb::$field_types + * @see wp_set_wpdb_vars() + * + * @param string $table Table name + * @param array $data Data to update (in column => value pairs). + * Both $data columns and $data values should be "raw" (neither should be SQL escaped). + * Sending a null value will cause the column to be set to NULL - the corresponding + * format is ignored in this case. + * @param array $where A named array of WHERE clauses (in column => value pairs). + * Multiple clauses will be joined with ANDs. + * Both $where columns and $where values should be "raw". + * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case. + * @param array|string $format Optional. An array of formats to be mapped to each of the values in $data. + * If string, that format will be used for all of the values in $data. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types. + * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where. + * If string, that format will be used for all of the items in $where. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $where will be treated as strings. + * @return int|false The number of rows updated, or false on error. + */ + public function update( $table, $data, $where, $format = null, $where_format = null ) { + if ( ! is_array( $data ) || ! is_array( $where ) ) { + return false; + } + + $data = $this->process_fields( $table, $data, $format ); + if ( false === $data ) { + return false; + } + $where = $this->process_fields( $table, $where, $where_format ); + if ( false === $where ) { + return false; + } + + $fields = array(); + $conditions = array(); + $values = array(); + foreach ( $data as $field => $value ) { + if ( is_null( $value['value'] ) ) { + $fields[] = "`$field` = NULL"; + continue; + } + + $fields[] = "`$field` = " . $value['format']; + $values[] = $value['value']; + } + foreach ( $where as $field => $value ) { + if ( is_null( $value['value'] ) ) { + $conditions[] = "`$field` IS NULL"; + continue; + } + + $conditions[] = "`$field` = " . $value['format']; + $values[] = $value['value']; + } + + $fields = implode( ', ', $fields ); + $conditions = implode( ' AND ', $conditions ); + + $sql = "UPDATE `$table` SET $fields WHERE $conditions"; + + $this->check_current_query = false; + return $this->query( $this->prepare( $sql, $values ) ); + } + + /** + * Delete a row in the table + * + * wpdb::delete( 'table', array( 'ID' => 1 ) ) + * wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) ) + * + * @since 3.4.0 + * @see wpdb::prepare() + * @see wpdb::$field_types + * @see wp_set_wpdb_vars() + * + * @param string $table Table name + * @param array $where A named array of WHERE clauses (in column => value pairs). + * Multiple clauses will be joined with ANDs. + * Both $where columns and $where values should be "raw". + * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case. + * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where. + * If string, that format will be used for all of the items in $where. + * A format is one of '%d', '%f', '%s' (integer, float, string). + * If omitted, all values in $where will be treated as strings unless otherwise specified in wpdb::$field_types. + * @return int|false The number of rows updated, or false on error. + */ + public function delete( $table, $where, $where_format = null ) { + if ( ! is_array( $where ) ) { + return false; + } + + $where = $this->process_fields( $table, $where, $where_format ); + if ( false === $where ) { + return false; + } + + $conditions = array(); + $values = array(); + foreach ( $where as $field => $value ) { + if ( is_null( $value['value'] ) ) { + $conditions[] = "`$field` IS NULL"; + continue; + } + + $conditions[] = "`$field` = " . $value['format']; + $values[] = $value['value']; + } + + $conditions = implode( ' AND ', $conditions ); + + $sql = "DELETE FROM `$table` WHERE $conditions"; + + $this->check_current_query = false; + return $this->query( $this->prepare( $sql, $values ) ); + } + + /** + * Processes arrays of field/value pairs and field formats. + * + * This is a helper method for wpdb's CRUD methods, which take field/value + * pairs for inserts, updates, and where clauses. This method first pairs + * each value with a format. Then it determines the charset of that field, + * using that to determine if any invalid text would be stripped. If text is + * stripped, then field processing is rejected and the query fails. + * + * @since 4.2.0 + * + * @param string $table Table name. + * @param array $data Field/value pair. + * @param mixed $format Format for each field. + * @return array|false Returns an array of fields that contain paired values + * and formats. Returns false for invalid values. + */ + protected function process_fields( $table, $data, $format ) { + $data = $this->process_field_formats( $data, $format ); + if ( false === $data ) { + return false; + } + + $data = $this->process_field_charsets( $data, $table ); + if ( false === $data ) { + return false; + } + + $data = $this->process_field_lengths( $data, $table ); + if ( false === $data ) { + return false; + } + + $converted_data = $this->strip_invalid_text( $data ); + + if ( $data !== $converted_data ) { + return false; + } + + return $data; + } + + /** + * Prepares arrays of value/format pairs as passed to wpdb CRUD methods. + * + * @since 4.2.0 + * + * @param array $data Array of fields to values. + * @param mixed $format Formats to be mapped to the values in $data. + * @return array Array, keyed by field names with values being an array + * of 'value' and 'format' keys. + */ + protected function process_field_formats( $data, $format ) { + $formats = (array) $format; + $original_formats = $formats; + + foreach ( $data as $field => $value ) { + $value = array( + 'value' => $value, + 'format' => '%s', + ); + + if ( ! empty( $format ) ) { + $value['format'] = array_shift( $formats ); + if ( ! $value['format'] ) { + $value['format'] = reset( $original_formats ); + } + } elseif ( isset( $this->field_types[ $field ] ) ) { + $value['format'] = $this->field_types[ $field ]; + } + + $data[ $field ] = $value; + } + + return $data; + } + + /** + * Adds field charsets to field/value/format arrays generated by + * the wpdb::process_field_formats() method. + * + * @since 4.2.0 + * + * @param array $data As it comes from the wpdb::process_field_formats() method. + * @param string $table Table name. + * @return array|false The same array as $data with additional 'charset' keys. + */ + protected function process_field_charsets( $data, $table ) { + foreach ( $data as $field => $value ) { + if ( '%d' === $value['format'] || '%f' === $value['format'] ) { + /* + * We can skip this field if we know it isn't a string. + * This checks %d/%f versus ! %s because its sprintf() could take more. + */ + $value['charset'] = false; + } else { + $value['charset'] = $this->get_col_charset( $table, $field ); + if ( is_wp_error( $value['charset'] ) ) { + return false; + } + } + + $data[ $field ] = $value; + } + + return $data; + } + + /** + * For string fields, record the maximum string length that field can safely save. + * + * @since 4.2.1 + * + * @param array $data As it comes from the wpdb::process_field_charsets() method. + * @param string $table Table name. + * @return array|false The same array as $data with additional 'length' keys, or false if + * any of the values were too long for their corresponding field. + */ + protected function process_field_lengths( $data, $table ) { + foreach ( $data as $field => $value ) { + if ( '%d' === $value['format'] || '%f' === $value['format'] ) { + /* + * We can skip this field if we know it isn't a string. + * This checks %d/%f versus ! %s because its sprintf() could take more. + */ + $value['length'] = false; + } else { + $value['length'] = $this->get_col_length( $table, $field ); + if ( is_wp_error( $value['length'] ) ) { + return false; + } + } + + $data[ $field ] = $value; + } + + return $data; + } + + /** + * Retrieve one variable from the database. + * + * Executes a SQL query and returns the value from the SQL result. + * If the SQL result contains more than one column and/or more than one row, this function returns the value in the column and row specified. + * If $query is null, this function returns the value in the specified column and row from the previous SQL result. + * + * @since 0.71 + * + * @param string|null $query Optional. SQL query. Defaults to null, use the result from the previous query. + * @param int $x Optional. Column of value to return. Indexed from 0. + * @param int $y Optional. Row of value to return. Indexed from 0. + * @return string|null Database query result (as string), or null on failure + */ + public function get_var( $query = null, $x = 0, $y = 0 ) { + $this->func_call = "\$db->get_var(\"$query\", $x, $y)"; + + if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { + $this->check_current_query = false; + } + + if ( $query ) { + $this->query( $query ); + } + + // Extract var out of cached results based x,y vals + if ( ! empty( $this->last_result[ $y ] ) ) { + $values = array_values( get_object_vars( $this->last_result[ $y ] ) ); + } + + // If there is a value return it else return null + return ( isset( $values[ $x ] ) && $values[ $x ] !== '' ) ? $values[ $x ] : null; + } + + /** + * Retrieve one row from the database. + * + * Executes a SQL query and returns the row from the SQL result. + * + * @since 0.71 + * + * @param string|null $query SQL query. + * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to + * an stdClass object, an associative array, or a numeric array, respectively. Default OBJECT. + * @param int $y Optional. Row to return. Indexed from 0. + * @return array|object|null|void Database query result in format specified by $output or null on failure + */ + public function get_row( $query = null, $output = OBJECT, $y = 0 ) { + $this->func_call = "\$db->get_row(\"$query\",$output,$y)"; + + if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { + $this->check_current_query = false; + } + + if ( $query ) { + $this->query( $query ); + } else { + return null; + } + + if ( ! isset( $this->last_result[ $y ] ) ) { + return null; + } + + if ( $output == OBJECT ) { + return $this->last_result[ $y ] ? $this->last_result[ $y ] : null; + } elseif ( $output == ARRAY_A ) { + return $this->last_result[ $y ] ? get_object_vars( $this->last_result[ $y ] ) : null; + } elseif ( $output == ARRAY_N ) { + return $this->last_result[ $y ] ? array_values( get_object_vars( $this->last_result[ $y ] ) ) : null; + } elseif ( strtoupper( $output ) === OBJECT ) { + // Back compat for OBJECT being previously case insensitive. + return $this->last_result[ $y ] ? $this->last_result[ $y ] : null; + } else { + $this->print_error( ' $db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N' ); + } + } + + /** + * Retrieve one column from the database. + * + * Executes a SQL query and returns the column from the SQL result. + * If the SQL result contains more than one column, this function returns the column specified. + * If $query is null, this function returns the specified column from the previous SQL result. + * + * @since 0.71 + * + * @param string|null $query Optional. SQL query. Defaults to previous query. + * @param int $x Optional. Column to return. Indexed from 0. + * @return array Database query result. Array indexed from 0 by SQL result row number. + */ + public function get_col( $query = null, $x = 0 ) { + if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { + $this->check_current_query = false; + } + + if ( $query ) { + $this->query( $query ); + } + + $new_array = array(); + // Extract the column values + if ( $this->last_result ) { + for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) { + $new_array[ $i ] = $this->get_var( null, $x, $i ); + } + } + return $new_array; + } + + /** + * Retrieve an entire SQL result set from the database (i.e., many rows) + * + * Executes a SQL query and returns the entire SQL result. + * + * @since 0.71 + * + * @param string $query SQL query. + * @param string $output Optional. Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants. + * With one of the first three, return an array of rows indexed from 0 by SQL result row number. + * Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively. + * With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value. + * Duplicate keys are discarded. + * @return array|object|null Database query results + */ + public function get_results( $query = null, $output = OBJECT ) { + $this->func_call = "\$db->get_results(\"$query\", $output)"; + + if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { + $this->check_current_query = false; + } + + if ( $query ) { + $this->query( $query ); + } else { + return null; + } + + $new_array = array(); + if ( $output == OBJECT ) { + // Return an integer-keyed array of row objects + return $this->last_result; + } elseif ( $output == OBJECT_K ) { + // Return an array of row objects with keys from column 1 + // (Duplicates are discarded) + if ( $this->last_result ) { + foreach ( $this->last_result as $row ) { + $var_by_ref = get_object_vars( $row ); + $key = array_shift( $var_by_ref ); + if ( ! isset( $new_array[ $key ] ) ) { + $new_array[ $key ] = $row; + } + } + } + return $new_array; + } elseif ( $output == ARRAY_A || $output == ARRAY_N ) { + // Return an integer-keyed array of... + if ( $this->last_result ) { + foreach ( (array) $this->last_result as $row ) { + if ( $output == ARRAY_N ) { + // ...integer-keyed row arrays + $new_array[] = array_values( get_object_vars( $row ) ); + } else { + // ...column name-keyed row arrays + $new_array[] = get_object_vars( $row ); + } + } + } + return $new_array; + } elseif ( strtoupper( $output ) === OBJECT ) { + // Back compat for OBJECT being previously case insensitive. + return $this->last_result; + } + return null; + } + + /** + * Retrieves the character set for the given table. + * + * @since 4.2.0 + * + * @param string $table Table name. + * @return string|WP_Error Table character set, WP_Error object if it couldn't be found. + */ + protected function get_table_charset( $table ) { + $tablekey = strtolower( $table ); + + /** + * Filters the table charset value before the DB is checked. + * + * Passing a non-null value to the filter will effectively short-circuit + * checking the DB for the charset, returning that value instead. + * + * @since 4.2.0 + * + * @param string|null $charset The character set to use. Default null. + * @param string $table The name of the table being checked. + */ + $charset = apply_filters( 'pre_get_table_charset', null, $table ); + if ( null !== $charset ) { + return $charset; + } + + if ( isset( $this->table_charset[ $tablekey ] ) ) { + return $this->table_charset[ $tablekey ]; + } + + $charsets = array(); + $columns = array(); + + $table_parts = explode( '.', $table ); + $table = '`' . implode( '`.`', $table_parts ) . '`'; + $results = $this->get_results( "SHOW FULL COLUMNS FROM $table" ); + if ( ! $results ) { + return new WP_Error( 'wpdb_get_table_charset_failure' ); + } + + foreach ( $results as $column ) { + $columns[ strtolower( $column->Field ) ] = $column; + } + + $this->col_meta[ $tablekey ] = $columns; + + foreach ( $columns as $column ) { + if ( ! empty( $column->Collation ) ) { + list( $charset ) = explode( '_', $column->Collation ); + + // If the current connection can't support utf8mb4 characters, let's only send 3-byte utf8 characters. + if ( 'utf8mb4' === $charset && ! $this->has_cap( 'utf8mb4' ) ) { + $charset = 'utf8'; + } + + $charsets[ strtolower( $charset ) ] = true; + } + + list( $type ) = explode( '(', $column->Type ); + + // A binary/blob means the whole query gets treated like this. + if ( in_array( strtoupper( $type ), array( 'BINARY', 'VARBINARY', 'TINYBLOB', 'MEDIUMBLOB', 'BLOB', 'LONGBLOB' ) ) ) { + $this->table_charset[ $tablekey ] = 'binary'; + return 'binary'; + } + } + + // utf8mb3 is an alias for utf8. + if ( isset( $charsets['utf8mb3'] ) ) { + $charsets['utf8'] = true; + unset( $charsets['utf8mb3'] ); + } + + // Check if we have more than one charset in play. + $count = count( $charsets ); + if ( 1 === $count ) { + $charset = key( $charsets ); + } elseif ( 0 === $count ) { + // No charsets, assume this table can store whatever. + $charset = false; + } else { + // More than one charset. Remove latin1 if present and recalculate. + unset( $charsets['latin1'] ); + $count = count( $charsets ); + if ( 1 === $count ) { + // Only one charset (besides latin1). + $charset = key( $charsets ); + } elseif ( 2 === $count && isset( $charsets['utf8'], $charsets['utf8mb4'] ) ) { + // Two charsets, but they're utf8 and utf8mb4, use utf8. + $charset = 'utf8'; + } else { + // Two mixed character sets. ascii. + $charset = 'ascii'; + } + } + + $this->table_charset[ $tablekey ] = $charset; + return $charset; + } + + /** + * Retrieves the character set for the given column. + * + * @since 4.2.0 + * + * @param string $table Table name. + * @param string $column Column name. + * @return string|false|WP_Error Column character set as a string. False if the column has no + * character set. WP_Error object if there was an error. + */ + public function get_col_charset( $table, $column ) { + $tablekey = strtolower( $table ); + $columnkey = strtolower( $column ); + + /** + * Filters the column charset value before the DB is checked. + * + * Passing a non-null value to the filter will short-circuit + * checking the DB for the charset, returning that value instead. + * + * @since 4.2.0 + * + * @param string|null $charset The character set to use. Default null. + * @param string $table The name of the table being checked. + * @param string $column The name of the column being checked. + */ + $charset = apply_filters( 'pre_get_col_charset', null, $table, $column ); + if ( null !== $charset ) { + return $charset; + } + + // Skip this entirely if this isn't a MySQL database. + if ( empty( $this->is_mysql ) ) { + return false; + } + + if ( empty( $this->table_charset[ $tablekey ] ) ) { + // This primes column information for us. + $table_charset = $this->get_table_charset( $table ); + if ( is_wp_error( $table_charset ) ) { + return $table_charset; + } + } + + // If still no column information, return the table charset. + if ( empty( $this->col_meta[ $tablekey ] ) ) { + return $this->table_charset[ $tablekey ]; + } + + // If this column doesn't exist, return the table charset. + if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) { + return $this->table_charset[ $tablekey ]; + } + + // Return false when it's not a string column. + if ( empty( $this->col_meta[ $tablekey ][ $columnkey ]->Collation ) ) { + return false; + } + + list( $charset ) = explode( '_', $this->col_meta[ $tablekey ][ $columnkey ]->Collation ); + return $charset; + } + + /** + * Retrieve the maximum string length allowed in a given column. + * The length may either be specified as a byte length or a character length. + * + * @since 4.2.1 + * + * @param string $table Table name. + * @param string $column Column name. + * @return array|false|WP_Error array( 'length' => (int), 'type' => 'byte' | 'char' ) + * false if the column has no length (for example, numeric column) + * WP_Error object if there was an error. + */ + public function get_col_length( $table, $column ) { + $tablekey = strtolower( $table ); + $columnkey = strtolower( $column ); + + // Skip this entirely if this isn't a MySQL database. + if ( empty( $this->is_mysql ) ) { + return false; + } + + if ( empty( $this->col_meta[ $tablekey ] ) ) { + // This primes column information for us. + $table_charset = $this->get_table_charset( $table ); + if ( is_wp_error( $table_charset ) ) { + return $table_charset; + } + } + + if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) { + return false; + } + + $typeinfo = explode( '(', $this->col_meta[ $tablekey ][ $columnkey ]->Type ); + + $type = strtolower( $typeinfo[0] ); + if ( ! empty( $typeinfo[1] ) ) { + $length = trim( $typeinfo[1], ')' ); + } else { + $length = false; + } + + switch ( $type ) { + case 'char': + case 'varchar': + return array( + 'type' => 'char', + 'length' => (int) $length, + ); + + case 'binary': + case 'varbinary': + return array( + 'type' => 'byte', + 'length' => (int) $length, + ); + + case 'tinyblob': + case 'tinytext': + return array( + 'type' => 'byte', + 'length' => 255, // 2^8 - 1 + ); + + case 'blob': + case 'text': + return array( + 'type' => 'byte', + 'length' => 65535, // 2^16 - 1 + ); + + case 'mediumblob': + case 'mediumtext': + return array( + 'type' => 'byte', + 'length' => 16777215, // 2^24 - 1 + ); + + case 'longblob': + case 'longtext': + return array( + 'type' => 'byte', + 'length' => 4294967295, // 2^32 - 1 + ); + + default: + return false; + } + } + + /** + * Check if a string is ASCII. + * + * The negative regex is faster for non-ASCII strings, as it allows + * the search to finish as soon as it encounters a non-ASCII character. + * + * @since 4.2.0 + * + * @param string $string String to check. + * @return bool True if ASCII, false if not. + */ + protected function check_ascii( $string ) { + if ( function_exists( 'mb_check_encoding' ) ) { + if ( mb_check_encoding( $string, 'ASCII' ) ) { + return true; + } + } elseif ( ! preg_match( '/[^\x00-\x7F]/', $string ) ) { + return true; + } + + return false; + } + + /** + * Check if the query is accessing a collation considered safe on the current version of MySQL. + * + * @since 4.2.0 + * + * @param string $query The query to check. + * @return bool True if the collation is safe, false if it isn't. + */ + protected function check_safe_collation( $query ) { + if ( $this->checking_collation ) { + return true; + } + + // We don't need to check the collation for queries that don't read data. + $query = ltrim( $query, "\r\n\t (" ); + if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $query ) ) { + return true; + } + + // All-ASCII queries don't need extra checking. + if ( $this->check_ascii( $query ) ) { + return true; + } + + $table = $this->get_table_from_query( $query ); + if ( ! $table ) { + return false; + } + + $this->checking_collation = true; + $collation = $this->get_table_charset( $table ); + $this->checking_collation = false; + + // Tables with no collation, or latin1 only, don't need extra checking. + if ( false === $collation || 'latin1' === $collation ) { + return true; + } + + $table = strtolower( $table ); + if ( empty( $this->col_meta[ $table ] ) ) { + return false; + } + + // If any of the columns don't have one of these collations, it needs more sanity checking. + foreach ( $this->col_meta[ $table ] as $col ) { + if ( empty( $col->Collation ) ) { + continue; + } + + if ( ! in_array( $col->Collation, array( 'utf8_general_ci', 'utf8_bin', 'utf8mb4_general_ci', 'utf8mb4_bin' ), true ) ) { + return false; + } + } + + return true; + } + + /** + * Strips any invalid characters based on value/charset pairs. + * + * @since 4.2.0 + * + * @param array $data Array of value arrays. Each value array has the keys + * 'value' and 'charset'. An optional 'ascii' key can be + * set to false to avoid redundant ASCII checks. + * @return array|WP_Error The $data parameter, with invalid characters removed from + * each value. This works as a passthrough: any additional keys + * such as 'field' are retained in each value array. If we cannot + * remove invalid characters, a WP_Error object is returned. + */ + protected function strip_invalid_text( $data ) { + $db_check_string = false; + + foreach ( $data as &$value ) { + $charset = $value['charset']; + + if ( is_array( $value['length'] ) ) { + $length = $value['length']['length']; + $truncate_by_byte_length = 'byte' === $value['length']['type']; + } else { + $length = false; + // Since we have no length, we'll never truncate. + // Initialize the variable to false. true would take us + // through an unnecessary (for this case) codepath below. + $truncate_by_byte_length = false; + } + + // There's no charset to work with. + if ( false === $charset ) { + continue; + } + + // Column isn't a string. + if ( ! is_string( $value['value'] ) ) { + continue; + } + + $needs_validation = true; + if ( + // latin1 can store any byte sequence + 'latin1' === $charset + || + // ASCII is always OK. + ( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) ) + ) { + $truncate_by_byte_length = true; + $needs_validation = false; + } + + if ( $truncate_by_byte_length ) { + mbstring_binary_safe_encoding(); + if ( false !== $length && strlen( $value['value'] ) > $length ) { + $value['value'] = substr( $value['value'], 0, $length ); + } + reset_mbstring_encoding(); + + if ( ! $needs_validation ) { + continue; + } + } + + // utf8 can be handled by regex, which is a bunch faster than a DB lookup. + if ( ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) && function_exists( 'mb_strlen' ) ) { + $regex = '/ + ( + (?: [\x00-\x7F] # single-byte sequences 0xxxxxxx + | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx + | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2 + | [\xE1-\xEC][\x80-\xBF]{2} + | \xED[\x80-\x9F][\x80-\xBF] + | [\xEE-\xEF][\x80-\xBF]{2}'; + + if ( 'utf8mb4' === $charset ) { + $regex .= ' + | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3 + | [\xF1-\xF3][\x80-\xBF]{3} + | \xF4[\x80-\x8F][\x80-\xBF]{2} + '; + } + + $regex .= '){1,40} # ...one or more times + ) + | . # anything else + /x'; + $value['value'] = preg_replace( $regex, '$1', $value['value'] ); + + if ( false !== $length && mb_strlen( $value['value'], 'UTF-8' ) > $length ) { + $value['value'] = mb_substr( $value['value'], 0, $length, 'UTF-8' ); + } + continue; + } + + // We couldn't use any local conversions, send it to the DB. + $value['db'] = true; + $db_check_string = true; + } + unset( $value ); // Remove by reference. + + if ( $db_check_string ) { + $queries = array(); + foreach ( $data as $col => $value ) { + if ( ! empty( $value['db'] ) ) { + // We're going to need to truncate by characters or bytes, depending on the length value we have. + if ( isset( $value['length']['type'] ) && 'byte' === $value['length']['type'] ) { + // Using binary causes LEFT() to truncate by bytes. + $charset = 'binary'; + } else { + $charset = $value['charset']; + } + + if ( $this->charset ) { + $connection_charset = $this->charset; + } else { + if ( $this->use_mysqli ) { + $connection_charset = mysqli_character_set_name( $this->dbh ); + } else { + $connection_charset = mysql_client_encoding(); + } + } + + if ( is_array( $value['length'] ) ) { + $length = sprintf( '%.0f', $value['length']['length'] ); + $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), $length ) USING $connection_charset )", $value['value'] ); + } elseif ( 'binary' !== $charset ) { + // If we don't have a length, there's no need to convert binary - it will always return the same result. + $queries[ $col ] = $this->prepare( "CONVERT( CONVERT( %s USING $charset ) USING $connection_charset )", $value['value'] ); + } + + unset( $data[ $col ]['db'] ); + } + } + + $sql = array(); + foreach ( $queries as $column => $query ) { + if ( ! $query ) { + continue; + } + + $sql[] = $query . " AS x_$column"; + } + + $this->check_current_query = false; + $row = $this->get_row( 'SELECT ' . implode( ', ', $sql ), ARRAY_A ); + if ( ! $row ) { + return new WP_Error( 'wpdb_strip_invalid_text_failure' ); + } + + foreach ( array_keys( $data ) as $column ) { + if ( isset( $row[ "x_$column" ] ) ) { + $data[ $column ]['value'] = $row[ "x_$column" ]; + } + } + } + + return $data; + } + + /** + * Strips any invalid characters from the query. + * + * @since 4.2.0 + * + * @param string $query Query to convert. + * @return string|WP_Error The converted query, or a WP_Error object if the conversion fails. + */ + protected function strip_invalid_text_from_query( $query ) { + // We don't need to check the collation for queries that don't read data. + $trimmed_query = ltrim( $query, "\r\n\t (" ); + if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $trimmed_query ) ) { + return $query; + } + + $table = $this->get_table_from_query( $query ); + if ( $table ) { + $charset = $this->get_table_charset( $table ); + if ( is_wp_error( $charset ) ) { + return $charset; + } + + // We can't reliably strip text from tables containing binary/blob columns + if ( 'binary' === $charset ) { + return $query; + } + } else { + $charset = $this->charset; + } + + $data = array( + 'value' => $query, + 'charset' => $charset, + 'ascii' => false, + 'length' => false, + ); + + $data = $this->strip_invalid_text( array( $data ) ); + if ( is_wp_error( $data ) ) { + return $data; + } + + return $data[0]['value']; + } + + /** + * Strips any invalid characters from the string for a given table and column. + * + * @since 4.2.0 + * + * @param string $table Table name. + * @param string $column Column name. + * @param string $value The text to check. + * @return string|WP_Error The converted string, or a WP_Error object if the conversion fails. + */ + public function strip_invalid_text_for_column( $table, $column, $value ) { + if ( ! is_string( $value ) ) { + return $value; + } + + $charset = $this->get_col_charset( $table, $column ); + if ( ! $charset ) { + // Not a string column. + return $value; + } elseif ( is_wp_error( $charset ) ) { + // Bail on real errors. + return $charset; + } + + $data = array( + $column => array( + 'value' => $value, + 'charset' => $charset, + 'length' => $this->get_col_length( $table, $column ), + ), + ); + + $data = $this->strip_invalid_text( $data ); + if ( is_wp_error( $data ) ) { + return $data; + } + + return $data[ $column ]['value']; + } + + /** + * Find the first table name referenced in a query. + * + * @since 4.2.0 + * + * @param string $query The query to search. + * @return string|false $table The table name found, or false if a table couldn't be found. + */ + protected function get_table_from_query( $query ) { + // Remove characters that can legally trail the table name. + $query = rtrim( $query, ';/-#' ); + + // Allow (select...) union [...] style queries. Use the first query's table name. + $query = ltrim( $query, "\r\n\t (" ); + + // Strip everything between parentheses except nested selects. + $query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', $query ); + + // Quickly match most common queries. + if ( preg_match( + '/^\s*(?:' + . 'SELECT.*?\s+FROM' + . '|INSERT(?:\s+LOW_PRIORITY|\s+DELAYED|\s+HIGH_PRIORITY)?(?:\s+IGNORE)?(?:\s+INTO)?' + . '|REPLACE(?:\s+LOW_PRIORITY|\s+DELAYED)?(?:\s+INTO)?' + . '|UPDATE(?:\s+LOW_PRIORITY)?(?:\s+IGNORE)?' + . '|DELETE(?:\s+LOW_PRIORITY|\s+QUICK|\s+IGNORE)*(?:.+?FROM)?' + . ')\s+((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)/is', + $query, + $maybe + ) ) { + return str_replace( '`', '', $maybe[1] ); + } + + // SHOW TABLE STATUS and SHOW TABLES WHERE Name = 'wp_posts' + if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES).+WHERE\s+Name\s*=\s*("|\')((?:[0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)\\1/is', $query, $maybe ) ) { + return $maybe[2]; + } + + // SHOW TABLE STATUS LIKE and SHOW TABLES LIKE 'wp\_123\_%' + // This quoted LIKE operand seldom holds a full table name. + // It is usually a pattern for matching a prefix so we just + // strip the trailing % and unescape the _ to get 'wp_123_' + // which drop-ins can use for routing these SQL statements. + if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES)\s+(?:WHERE\s+Name\s+)?LIKE\s*("|\')((?:[\\\\0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)%?\\1/is', $query, $maybe ) ) { + return str_replace( '\\_', '_', $maybe[2] ); + } + + // Big pattern for the rest of the table-related queries. + if ( preg_match( + '/^\s*(?:' + . '(?:EXPLAIN\s+(?:EXTENDED\s+)?)?SELECT.*?\s+FROM' + . '|DESCRIBE|DESC|EXPLAIN|HANDLER' + . '|(?:LOCK|UNLOCK)\s+TABLE(?:S)?' + . '|(?:RENAME|OPTIMIZE|BACKUP|RESTORE|CHECK|CHECKSUM|ANALYZE|REPAIR).*\s+TABLE' + . '|TRUNCATE(?:\s+TABLE)?' + . '|CREATE(?:\s+TEMPORARY)?\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?' + . '|ALTER(?:\s+IGNORE)?\s+TABLE' + . '|DROP\s+TABLE(?:\s+IF\s+EXISTS)?' + . '|CREATE(?:\s+\w+)?\s+INDEX.*\s+ON' + . '|DROP\s+INDEX.*\s+ON' + . '|LOAD\s+DATA.*INFILE.*INTO\s+TABLE' + . '|(?:GRANT|REVOKE).*ON\s+TABLE' + . '|SHOW\s+(?:.*FROM|.*TABLE)' + . ')\s+\(*\s*((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\s*\)*/is', + $query, + $maybe + ) ) { + return str_replace( '`', '', $maybe[1] ); + } + + return false; + } + + /** + * Load the column metadata from the last query. + * + * @since 3.5.0 + */ + protected function load_col_info() { + if ( $this->col_info ) { + return; + } + + if ( $this->use_mysqli ) { + $num_fields = mysqli_num_fields( $this->result ); + for ( $i = 0; $i < $num_fields; $i++ ) { + $this->col_info[ $i ] = mysqli_fetch_field( $this->result ); + } + } else { + $num_fields = mysql_num_fields( $this->result ); + for ( $i = 0; $i < $num_fields; $i++ ) { + $this->col_info[ $i ] = mysql_fetch_field( $this->result, $i ); + } + } + } + + /** + * Retrieve column metadata from the last query. + * + * @since 0.71 + * + * @param string $info_type Optional. Type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill + * @param int $col_offset Optional. 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type + * @return mixed Column Results + */ + public function get_col_info( $info_type = 'name', $col_offset = -1 ) { + $this->load_col_info(); + + if ( $this->col_info ) { + if ( $col_offset == -1 ) { + $i = 0; + $new_array = array(); + foreach ( (array) $this->col_info as $col ) { + $new_array[ $i ] = $col->{$info_type}; + $i++; + } + return $new_array; + } else { + return $this->col_info[ $col_offset ]->{$info_type}; + } + } + } + + /** + * Starts the timer, for debugging purposes. + * + * @since 1.5.0 + * + * @return true + */ + public function timer_start() { + $this->time_start = microtime( true ); + return true; + } + + /** + * Stops the debugging timer. + * + * @since 1.5.0 + * + * @return float Total time spent on the query, in seconds + */ + public function timer_stop() { + return ( microtime( true ) - $this->time_start ); + } + + /** + * Wraps errors in a nice header and footer and dies. + * + * Will not die if wpdb::$show_errors is false. + * + * @since 1.5.0 + * + * @param string $message The Error message + * @param string $error_code Optional. A Computer readable string to identify the error. + * @return false|void + */ + public function bail( $message, $error_code = '500' ) { + if ( $this->show_errors ) { + $error = ''; + + if ( $this->use_mysqli ) { + if ( $this->dbh instanceof mysqli ) { + $error = mysqli_error( $this->dbh ); + } elseif ( mysqli_connect_errno() ) { + $error = mysqli_connect_error(); + } + } else { + if ( is_resource( $this->dbh ) ) { + $error = mysql_error( $this->dbh ); + } else { + $error = mysql_error(); + } + } + + if ( $error ) { + $message = '<p><code>' . $error . "</code></p>\n" . $message; + } + + wp_die( $message ); + } else { + if ( class_exists( 'WP_Error', false ) ) { + $this->error = new WP_Error( $error_code, $message ); + } else { + $this->error = $message; + } + + return false; + } + } + + + /** + * Closes the current database connection. + * + * @since 4.5.0 + * + * @return bool True if the connection was successfully closed, false if it wasn't, + * or the connection doesn't exist. + */ + public function close() { + if ( ! $this->dbh ) { + return false; + } + + if ( $this->use_mysqli ) { + $closed = mysqli_close( $this->dbh ); + } else { + $closed = mysql_close( $this->dbh ); + } + + if ( $closed ) { + $this->dbh = null; + $this->ready = false; + $this->has_connected = false; + } + + return $closed; + } + + /** + * Whether MySQL database is at least the required minimum version. + * + * @since 2.5.0 + * + * @global string $wp_version + * @global string $required_mysql_version + * + * @return WP_Error|void + */ + public function check_database_version() { + global $wp_version, $required_mysql_version; + // Make sure the server has the required MySQL version + if ( version_compare( $this->db_version(), $required_mysql_version, '<' ) ) { + /* translators: 1: WordPress version number, 2: Minimum required MySQL version number. */ + return new WP_Error( 'database_version', sprintf( __( '<strong>ERROR</strong>: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ) ); + } + } + + /** + * Whether the database supports collation. + * + * Called when WordPress is generating the table scheme. + * + * Use `wpdb::has_cap( 'collation' )`. + * + * @since 2.5.0 + * @deprecated 3.5.0 Use wpdb::has_cap() + * + * @return bool True if collation is supported, false if version does not + */ + public function supports_collation() { + _deprecated_function( __FUNCTION__, '3.5.0', 'wpdb::has_cap( \'collation\' )' ); + return $this->has_cap( 'collation' ); + } + + /** + * The database character collate. + * + * @since 3.5.0 + * + * @return string The database character collate. + */ + public function get_charset_collate() { + $charset_collate = ''; + + if ( ! empty( $this->charset ) ) { + $charset_collate = "DEFAULT CHARACTER SET $this->charset"; + } + if ( ! empty( $this->collate ) ) { + $charset_collate .= " COLLATE $this->collate"; + } + + return $charset_collate; + } + + /** + * Determine if a database supports a particular feature. + * + * @since 2.7.0 + * @since 4.1.0 Added support for the 'utf8mb4' feature. + * @since 4.6.0 Added support for the 'utf8mb4_520' feature. + * + * @see wpdb::db_version() + * + * @param string $db_cap The feature to check for. Accepts 'collation', + * 'group_concat', 'subqueries', 'set_charset', + * 'utf8mb4', or 'utf8mb4_520'. + * @return int|false Whether the database feature is supported, false otherwise. + */ + public function has_cap( $db_cap ) { + $version = $this->db_version(); + + switch ( strtolower( $db_cap ) ) { + case 'collation': // @since 2.5.0 + case 'group_concat': // @since 2.7.0 + case 'subqueries': // @since 2.7.0 + return version_compare( $version, '4.1', '>=' ); + case 'set_charset': + return version_compare( $version, '5.0.7', '>=' ); + case 'utf8mb4': // @since 4.1.0 + if ( version_compare( $version, '5.5.3', '<' ) ) { + return false; + } + if ( $this->use_mysqli ) { + $client_version = mysqli_get_client_info(); + } else { + $client_version = mysql_get_client_info(); + } + + /* + * libmysql has supported utf8mb4 since 5.5.3, same as the MySQL server. + * mysqlnd has supported utf8mb4 since 5.0.9. + */ + if ( false !== strpos( $client_version, 'mysqlnd' ) ) { + $client_version = preg_replace( '/^\D+([\d.]+).*/', '$1', $client_version ); + return version_compare( $client_version, '5.0.9', '>=' ); + } else { + return version_compare( $client_version, '5.5.3', '>=' ); + } + case 'utf8mb4_520': // @since 4.6.0 + return version_compare( $version, '5.6', '>=' ); + } + + return false; + } + + /** + * Retrieve the name of the function that called wpdb. + * + * Searches up the list of functions until it reaches + * the one that would most logically had called this method. + * + * @since 2.5.0 + * + * @return string Comma separated list of the calling functions. + */ + public function get_caller() { + return wp_debug_backtrace_summary( __CLASS__ ); + } + + /** + * Retrieves the MySQL server version. + * + * @since 2.7.0 + * + * @return null|string Null on failure, version number on success. + */ + public function db_version() { + if ( $this->use_mysqli ) { + $server_info = mysqli_get_server_info( $this->dbh ); + } else { + $server_info = mysql_get_server_info( $this->dbh ); + } + return preg_replace( '/[^0-9.].*/', '', $server_info ); + } +} |