+ /**
+ * The number of times to retry reconnecting before dying.
+ *
+ * @since 3.9.0
+ * @access protected
+ * @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
+ * @access private
+ * @var string
+ */
+ var $prefix = '';
+
+ /**
+ * WordPress base table prefix.
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $base_prefix;
+
+ /**
+ * Whether the database queries are ready to start executing.
+ *
+ * @since 2.3.2
+ * @access private
+ * @var bool
+ */
+ var $ready = false;
+
+ /**
+ * {@internal Missing Description}}
+ *
+ * @since 3.0.0
+ * @access public
+ * @var int
+ */
+ public $blogid = 0;
+
+ /**
+ * {@internal Missing Description}}
+ *
+ * @since 3.0.0
+ * @access public
+ * @var int
+ */
+ public $siteid = 0;
+
+ /**
+ * List of WordPress per-blog tables
+ *
+ * @since 2.5.0
+ * @access private
+ * @see wpdb::tables()
+ * @var array
+ */
+ var $tables = array( 'posts', 'comments', 'links', 'options', 'postmeta',
+ 'terms', 'term_taxonomy', 'term_relationships', 'commentmeta' );
+
+ /**
+ * List of deprecated WordPress tables
+ *
+ * categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539
+ *
+ * @since 2.9.0
+ * @access private
+ * @see wpdb::tables()
+ * @var array
+ */
+ var $old_tables = array( 'categories', 'post2cat', 'link2cat' );
+
+ /**
+ * List of WordPress global tables
+ *
+ * @since 3.0.0
+ * @access private
+ * @see wpdb::tables()
+ * @var array
+ */
+ var $global_tables = array( 'users', 'usermeta' );
+
+ /**
+ * List of Multisite global tables
+ *
+ * @since 3.0.0
+ * @access private
+ * @see wpdb::tables()
+ * @var array
+ */
+ var $ms_global_tables = array( 'blogs', 'signups', 'site', 'sitemeta',
+ 'sitecategories', 'registration_log', 'blog_versions' );
+
+ /**
+ * WordPress Comments table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $comments;
+
+ /**
+ * WordPress Comment Metadata table
+ *
+ * @since 2.9.0
+ * @access public
+ * @var string
+ */
+ public $commentmeta;
+
+ /**
+ * WordPress Links table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $links;
+
+ /**
+ * WordPress Options table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $options;
+
+ /**
+ * WordPress Post Metadata table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $postmeta;
+
+ /**
+ * WordPress Posts table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $posts;
+
+ /**
+ * WordPress Terms table
+ *
+ * @since 2.3.0
+ * @access public
+ * @var string
+ */
+ public $terms;
+
+ /**
+ * WordPress Term Relationships table
+ *
+ * @since 2.3.0
+ * @access public
+ * @var string
+ */
+ public $term_relationships;
+
+ /**
+ * WordPress Term Taxonomy table
+ *
+ * @since 2.3.0
+ * @access public
+ * @var string
+ */
+ public $term_taxonomy;
+
+ /*
+ * Global and Multisite tables
+ */
+
+ /**
+ * WordPress User Metadata table
+ *
+ * @since 2.3.0
+ * @access public
+ * @var string
+ */
+ public $usermeta;
+
+ /**
+ * WordPress Users table
+ *
+ * @since 1.5.0
+ * @access public
+ * @var string
+ */
+ public $users;
+
+ /**
+ * Multisite Blogs table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $blogs;
+
+ /**
+ * Multisite Blog Versions table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $blog_versions;
+
+ /**
+ * Multisite Registration Log table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $registration_log;
+
+ /**
+ * Multisite Signups table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $signups;
+
+ /**
+ * Multisite Sites table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $site;
+
+ /**
+ * Multisite Sitewide Terms table
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ public $sitecategories;
+
+ /**
+ * Multisite Site Metadata table
+ *
+ * @since 3.0.0
+ * @access public
+ * @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()
+ * @access public
+ * @var array
+ */
+ public $field_types = array();
+
+ /**
+ * Database table columns charset
+ *
+ * @since 2.2.0
+ * @access public
+ * @var string
+ */
+ public $charset;
+
+ /**
+ * Database table columns collate
+ *
+ * @since 2.2.0
+ * @access public
+ * @var string
+ */
+ public $collate;
+
+ /**
+ * Database Username
+ *
+ * @since 2.9.0
+ * @access protected
+ * @var string
+ */
+ protected $dbuser;
+
+ /**
+ * Database Password
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbpassword;
+
+ /**
+ * Database Name
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbname;
+
+ /**
+ * Database Host
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbhost;
+
+ /**
+ * Database Handle
+ *
+ * @since 0.71
+ * @access protected
+ * @var string
+ */
+ protected $dbh;
+
+ /**
+ * A textual description of the last query/get_row/get_var call
+ *
+ * @since 3.0.0
+ * @access public
+ * @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
+ * @access public
+ * @var bool
+ */
+ public $is_mysql = null;
+
+ /**
+ * A list of incompatible SQL modes.
+ *
+ * @since 3.9.0
+ * @access protected
+ * @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
+ * @access private
+ * @var bool
+ */
+ private $use_mysqli = false;
+
+ /**
+ * Whether we've managed to successfully connect at some point
+ *
+ * @since 3.9.0
+ * @access private
+ * @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
+ *
+ * @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 and:
+ * - WP_USE_EXT_MYSQL is defined as false, or
+ * - We are a development version of WordPress, or
+ * - We are running PHP 5.5 or greater, or
+ * - ext/mysql is not loaded.
+ */
+ if ( function_exists( 'mysqli_connect' ) ) {
+ if ( defined( 'WP_USE_EXT_MYSQL' ) ) {
+ $this->use_mysqli = ! WP_USE_EXT_MYSQL;
+ } elseif ( version_compare( phpversion(), '5.5', '>=' ) || ! function_exists( 'mysql_connect' ) ) {
+ $this->use_mysqli = true;
+ } elseif ( false !== strpos( $GLOBALS['wp_version'], '-' ) ) {
+ $this->use_mysqli = true;
+ }
+ }
+
+ $this->init_charset();
+
+ $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 bool true
+ */
+ public function __destruct() {
+ return true;
+ }
+
+ /**
+ * PHP5 style magic getter, used to lazy-load expensive data.
+ *
+ * @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;
+ }
+
+ /**
+ * Magic function, for backwards 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;
+ }
+
+ /**
+ * Magic function, for backwards 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 );
+ }
+
+ /**
+ * Magic function, for backwards 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() {
+ if ( function_exists('is_multisite') && is_multisite() ) {
+ $this->charset = 'utf8';
+ if ( defined( 'DB_COLLATE' ) && DB_COLLATE )
+ $this->collate = DB_COLLATE;
+ else
+ $this->collate = 'utf8_general_ci';
+ } elseif ( defined( 'DB_COLLATE' ) ) {
+ $this->collate = DB_COLLATE;
+ }
+
+ if ( defined( 'DB_CHARSET' ) )
+ $this->charset = DB_CHARSET;
+ }
+
+ /**
+ * 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 ) ) {
+ if ( $this->use_mysqli ) {
+ if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
+ mysqli_set_charset( $dbh, $charset );
+ } else {
+ $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' ) ) {
+ mysql_set_charset( $charset, $dbh );
+ } else {
+ $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 );
+
+ /**
+ * Filter 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
+ * @access public
+ * @param int $blog_id
+ * @param int $site_id Optional.
+ * @return int previous blog id
+ */
+ public function set_blog_id( $blog_id, $site_id = 0 ) {
+ if ( ! empty( $site_id ) )
+ $this->siteid = $site_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 $dbh Optional link identifier.
+ * @return null Always null.
+ */
+ 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();
+ $this->bail( sprintf( __( '<h1>Can’t select database</h1>
+<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$s</code> database.</p>
+<ul>
+<li>Are you sure it exists?</li>
+<li>Does the user <code>%2$s</code> have permission to use the <code>%1$s</code> database?</li>
+<li>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?</li>
+</ul>
+<p>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="https://wordpress.org/support/">WordPress Support Forums</a>.</p>' ), htmlspecialchars( $db, ENT_QUOTES ), htmlspecialchars( $this->dbuser, ENT_QUOTES ) ), 'db_select_fail' );
+ }
+ return;
+ }
+ }
+
+ /**
+ * Do not use, deprecated.
+ *
+ * Use esc_sql() or wpdb::prepare() instead.
+ *
+ * @since 2.8.0
+ * @deprecated 3.6.0
+ * @see wpdb::prepare
+ * @see esc_sql()
+ * @access private
+ *
+ * @param string $string
+ * @return string
+ */
+ function _weak_escape( $string ) {
+ if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) )
+ _deprecated_function( __METHOD__, '3.6', '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
+ * @access private
+ *
+ * @param string $string to escape
+ * @return string escaped
+ */
+ function _real_escape( $string ) {
+ if ( $this->dbh ) {
+ if ( $this->use_mysqli ) {
+ return mysqli_real_escape_string( $this->dbh, $string );
+ } else {
+ return mysql_real_escape_string( $string, $this->dbh );
+ }
+ }
+
+ $class = get_class( $this );
+ if ( function_exists( '__' ) ) {
+ _doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), E_USER_NOTICE );
+ } else {
+ _doing_it_wrong( $class, sprintf( '%s must set a database connection for use with escaping.', $class ), E_USER_NOTICE );
+ }
+ return addslashes( $string );
+ }
+
+ /**
+ * Escape data. Works on arrays.
+ *
+ * @uses wpdb::_real_escape()
+ * @since 2.8.0
+ * @access private
+ *
+ * @param string|array $data
+ * @return string|array escaped
+ */
+ 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
+ * @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', '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 $string to escape
+ * @return void
+ */
+ public function escape_by_ref( &$string ) {
+ if ( ! is_float( $string ) )
+ $string = $this->_real_escape( $string );
+ }
+
+ /**
+ * Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
+ *
+ * The following directives can be used in the query format string:
+ * %d (integer)
+ * %f (float)
+ * %s (string)
+ * %% (literal percentage sign - no argument needed)
+ *
+ * All of %d, %f, and %s are to be left unquoted in the query string and they need an argument passed for them.
+ * Literals (%) as parts of the query must be properly written as %%.
+ *
+ * This function only supports a small subset of the sprintf syntax; it only supports %d (integer), %f (float), and %s (string).
+ * Does not support sign, padding, alignment, width or precision specifiers.
+ * Does not support argument numbering/swapping.
+ *
+ * May be called like {@link http://php.net/sprintf sprintf()} or like {@link http://php.net/vsprintf vsprintf()}.
+ *
+ * Both %d and %s should be left unquoted in the query string.
+ *
+ * wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", 'foo', 1337 )
+ * wpdb::prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' );
+ *
+ * @link http://php.net/sprintf Description of syntax.
+ * @since 2.3.0
+ *
+ * @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 like
+ * {@link http://php.net/vsprintf vsprintf()}, or the first variable to substitute into the query's placeholders if
+ * being called like {@link http://php.net/sprintf sprintf()}.
+ * @param mixed $args,... further variables to substitute into the query's placeholders if being called like
+ * {@link http://php.net/sprintf sprintf()}.
+ * @return null|false|string Sanitized query string, null if there is no query, false if there is an error and string
+ * if there was something 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 ) {
+ _doing_it_wrong( 'wpdb::prepare', sprintf( __( 'The query argument of %s must have a placeholder.' ), 'wpdb::prepare()' ), '3.9' );
+ }
+
+ $args = func_get_args();
+ array_shift( $args );
+ // If args were passed as an array (as in vsprintf), move them up
+ if ( isset( $args[0] ) && is_array($args[0]) )
+ $args = $args[0];
+ $query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it
+ $query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting
+ $query = preg_replace( '|(?<!%)%f|' , '%F', $query ); // Force floats to be locale unaware
+ $query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
+ array_walk( $args, array( $this, 'escape_by_ref' ) );
+ return @vsprintf( $query, $args );
+ }
+
+ /**
+ * 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
+ * @access public
+ *
+ * @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|null 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();
+
+ if ( $caller = $this->get_caller() )
+ $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller );
+ else
+ $error_str = sprintf( __( 'WordPress database error %1$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() ) {
+ $msg = "WordPress database error: [$str]\n{$this->last_query}\n";
+ if ( defined( 'ERRORLOGFILE' ) )
+ error_log( $msg, 3, ERRORLOGFILE );
+ if ( defined( 'DIEONDBERROR' ) )
+ wp_die( $msg );
+ } else {
+ $str = htmlspecialchars( $str, ENT_QUOTES );
+ $query = htmlspecialchars( $this->last_query, ENT_QUOTES );
+
+ print "<div id='error'>
+ <p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
+ <code>$query</code></p>
+ </div>";
+ }
+ }
+
+ /**
+ * 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
+ * @return void
+ */
+ public function flush() {
+ $this->last_result = array();
+ $this->col_info = null;
+ $this->last_query = null;
+ $this->rows_affected = $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 );
+ }
+ } else if ( 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 null|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();
+
+ // 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.
+ $port = null;
+ $socket = null;
+ $host = $this->dbhost;
+ $port_or_socket = strstr( $host, ':' );
+ if ( ! empty( $port_or_socket ) ) {
+ $host = substr( $host, 0, strpos( $host, ':' ) );
+ $port_or_socket = substr( $port_or_socket, 1 );
+ if ( 0 !== strpos( $port_or_socket, '/' ) ) {
+ $port = intval( $port_or_socket );
+ $maybe_socket = strstr( $port_or_socket, ':' );
+ if ( ! empty( $maybe_socket ) ) {
+ $socket = substr( $maybe_socket, 1 );
+ }
+ } else {
+ $socket = $port_or_socket;
+ }
+ }
+
+ if ( WP_DEBUG ) {
+ mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
+ } else {
+ @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;
+ } else if ( defined( 'WP_USE_EXT_MYSQL' ) && ! WP_USE_EXT_MYSQL ) {
+ $attempt_fallback = false;
+ } else if ( ! function_exists( 'mysql_connect' ) ) {
+ $attempt_fallback = false;
+ }
+
+ if ( $attempt_fallback ) {
+ $this->use_mysqli = false;
+ $this->db_connect();
+ }
+ }
+ } else {
+ if ( WP_DEBUG ) {
+ $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
+ } else {
+ $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();
+ }
+
+ $this->bail( sprintf( __( "