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<?php
/**
 * WordPress database access abstraction 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 class.
 *
 * This class is used to interact with a database without needing to use raw SQL statements.
 * By default, WordPress uses this class to instantiate the global $wpdb object, providing
 * access to the WordPress database.
 *
 * 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://developer.wordpress.org/reference/classes/wpdb/
 *
 * @since 0.71
 */
#[AllowDynamicProperties]
class wpdb {

/**
	 * Whether to show SQL/DB errors.
	 *
	 * Default is to show errors if both WP_DEBUG and WP_DEBUG_DISPLAY evaluate to true.
	 *
	 * @since 0.71
	 *
	 * @var bool
	 */
	public $show_errors = false;

/**
	 * Whether to suppress errors during the DB bootstrapping. Default false.
	 *
	 * @since 2.5.0
	 *
	 * @var bool
	 */
	public $suppress_errors = false;

/**
	 * The error encountered during the last query.
	 *
	 * @since 2.5.0
	 *
	 * @var string
	 */
	public $last_error = '';

/**
	 * The number of queries made.
	 *
	 * @since 1.2.0
	 *
	 * @var int
	 */
	public $num_queries = 0;

/**
	 * Count of rows returned by the last query.
	 *
	 * @since 0.71
	 *
	 * @var int
	 */
	public $num_rows = 0;

/**
	 * Count of rows affected by the last query.
	 *
	 * @since 0.71
	 *
	 * @var int
	 */
	public $rows_affected = 0;

/**
	 * The ID generated for an AUTO_INCREMENT column by the last query (usually INSERT).
	 *
	 * @since 0.71
	 *
	 * @var int
	 */
	public $insert_id = 0;

/**
	 * The last query made.
	 *
	 * @since 0.71
	 *
	 * @var string
	 */
	public $last_query;

/**
	 * Results of the last query.
	 *
	 * @since 0.71
	 *
	 * @var stdClass[]|null
	 */
	public $last_result;

/**
	 * Database query result.
	 *
	 * Possible values:
	 *
	 * - `mysqli_result` instance for successful SELECT, SHOW, DESCRIBE, or EXPLAIN queries
	 * - `true` for other query types that were successful
	 * - `null` if a query is yet to be made or if the result has since been flushed
	 * - `false` if the query returned an error
	 *
	 * @since 0.71
	 *
	 * @var mysqli_result|bool|null
	 */
	protected $result;

/**
	 * Cached column info, for confidence checking data before inserting.
	 *
	 * @since 4.2.0
	 *
	 * @var array
	 */
	protected $col_meta = array();

/**
	 * Calculated character sets keyed by table name.
	 *
	 * @since 4.2.0
	 *
	 * @var string[]
	 */
	protected $table_charset = array();

/**
	 * Whether text fields in the current query need to be confidence 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 arrays containing information about 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.
	 *     }
	 * }
	 */
	public $queries;

/**
	 * The number of times to retry reconnecting before dying. Default 5.
	 *
	 * @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
	 */
	public $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-site tables.
	 *
	 * @since 2.5.0
	 *
	 * @see wpdb::tables()
	 * @var string[]
	 */
	public $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 string[]
	 */
	public $old_tables = array( 'categories', 'post2cat', 'link2cat' );

/**
	 * List of WordPress global tables.
	 *
	 * @since 3.0.0
	 *
	 * @see wpdb::tables()
	 * @var string[]
	 */
	public $global_tables = array( 'users', 'usermeta' );

/**
	 * List of Multisite global tables.
	 *
	 * @since 3.0.0
	 *
	 * @see wpdb::tables()
	 * @var string[]
	 */
	public $ms_global_tables = array(
		'blogs',
		'blogmeta',
		'signups',
		'site',
		'sitemeta',
		'registration_log',
	);

/**
	 * List of deprecated WordPress Multisite global tables.
	 *
	 * @since 6.1.0
	 *
	 * @see wpdb::tables()
	 * @var string[]
	 */
	public $old_ms_global_tables = array( 'sitecategories' );

/**
	 * 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.
	 *
	 * Possible values:
	 *
	 * - `mysqli` instance during normal operation
	 * - `null` if the connection is yet to be made or has been closed
	 * - `false` if the connection has failed
	 *
	 * @since 0.71
	 *
	 * @var mysqli|false|null
	 */
	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 string[]
	 */
	protected $incompatible_modes = array(
		'NO_ZERO_DATE',
		'ONLY_FULL_GROUP_BY',
		'STRICT_TRANS_TABLES',
		'STRICT_ALL_TABLES',
		'TRADITIONAL',
		'ANSI',
	);

/**
	 * Backward compatibility, where wpdb::prepare() has not quoted formatted/argnum placeholders.
	 *
	 * This is often used for table/field names (before %i was supported), and sometimes string formatting, e.g.
	 *
	 *     $wpdb->prepare( 'WHERE `%1$s` = "%2$s something %3$s" OR %1$s = "%4$-10s"', 'field_1', 'a', 'b', 'c' );
	 *
	 * But it's risky, e.g. forgetting to add quotes, resulting in SQL Injection vulnerabilities:
	 *
	 *     $wpdb->prepare( 'WHERE (id = %1s) OR (id = %2$s)', $_GET['id'], $_GET['id'] ); // ?id=id
	 *
	 * This feature is preserved while plugin authors update their code to use safer approaches:
	 *
	 *     $_GET['key'] = 'a`b';
	 *
	 *     $wpdb->prepare( 'WHERE %1s = %s',        $_GET['key'], $_GET['value'] ); // WHERE a`b = 'value'
	 *     $wpdb->prepare( 'WHERE `%1$s` = "%2$s"', $_GET['key'], $_GET['value'] ); // WHERE `a`b` = "value"
	 *
	 *     $wpdb->prepare( 'WHERE %i = %s',         $_GET['key'], $_GET['value'] ); // WHERE `a``b` = 'value'
	 *
	 * While changing to false will be fine for queries not using formatted/argnum placeholders,
	 * any remaining cases are most likely going to result in SQL errors (good, in a way):
	 *
	 *     $wpdb->prepare( 'WHERE %1$s = "%2$-10s"', 'my_field', 'my_value' );
	 *     true  = WHERE my_field = "my_value  "
	 *     false = WHERE 'my_field' = "'my_value  '"
	 *
	 * But there may be some queries that result in an SQL Injection vulnerability:
	 *
	 *     $wpdb->prepare( 'WHERE id = %1$s', $_GET['id'] ); // ?id=id
	 *
	 * So there may need to be a `_doing_it_wrong()` phase, after we know everyone can use
	 * identifier placeholders (%i), but before this feature is disabled or removed.
	 *
	 * @since 6.2.0
	 * @var bool
	 */
	private $allow_unsafe_unquoted_parameters = true;

/**
	 * Whether to use the mysqli extension over mysql. This is no longer used as the mysql
	 * extension is no longer supported.
	 *
	 * Default true.
	 *
	 * @since 3.9.0
	 * @since 6.4.0 This property was removed.
	 * @since 6.4.1 This property was reinstated and its default value was changed to true.
	 *              The property is no longer used in core but may be accessed externally.
	 *
	 * @var bool
	 */
	private $use_mysqli = true;

/**
	 * Whether we've managed to successfully connect at some point.
	 *
	 * @since 3.9.0
	 *
	 * @var bool
	 */
	private $has_connected = false;

/**
	 * Time when the last query was performed.
	 *
	 * Only set when `SAVEQUERIES` is defined and truthy.
	 *
	 * @since 1.5.0
	 *
	 * @var float
	 */
	public $time_start = null;

/**
	 * The last SQL error that was encountered.
	 *
	 * @since 2.5.0
	 *
	 * @var WP_Error|string
	 */
	public $error = null;

/**
	 * Connects to the database server and selects a database.
	 *
	 * Does the actual setting up
	 * of the class properties and connection to the database.
	 *
	 * @since 2.0.8
	 *
	 * @link https://core.trac.wordpress.org/ticket/3354
	 *
	 * @param string $dbuser     Database user.
	 * @param string $dbpassword Database password.
	 * @param string $dbname     Database name.
	 * @param string $dbhost     Database host.
	 */
	public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {
		if ( WP_DEBUG && WP_DEBUG_DISPLAY ) {
			$this->show_errors();
		}

$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();
	}

/**
	 * 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',
			'allow_unsafe_unquoted_parameters',
		);
		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 );
	}

/**
	 * Sets $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.
	 *
	 *     @type string $charset Character set.
	 *     @type string $collate Collation.
	 * }
	 */
	public function determine_charset( $charset, $collate ) {
		if ( ( ! ( $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 mysqli $dbh     The connection returned by `mysqli_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 ( 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 );
			}
		}
	}

/**
	 * Changes the current SQL mode, and ensures 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. Default empty array.
	 */
	public function set_sql_mode( $modes = array() ) {
		if ( empty( $modes ) ) {
			$res = mysqli_query( $this->dbh, 'SELECT @@SESSION.sql_mode' );

if ( empty( $res ) ) {
				return;
			}

$modes_array = mysqli_fetch_array( $res );

if ( empty( $modes_array[0] ) ) {
				return;
			}

$modes_str = $modes_array[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, true ) ) {
				unset( $modes[ $i ] );
			}
		}

$modes_str = implode( ',', $modes );

mysqli_query( $this->dbh, "SET SESSION sql_mode='$modes_str'" );
	}

/**
	 * 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. Default true.
	 * @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. Network ID. Default 0.
	 * @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. Blog ID to retrieve the table prefix for.
	 *                     Defaults to the current blog ID.
	 * @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 `$scope` argument can take one of the following:
	 *
	 * - 'all' - returns 'all' and 'global' tables. No old tables are returned.
	 * - 'blog' - returns the blog-level tables for the queried blog.
	 * - 'global' - returns the global tables for the installation, returning multisite tables only on multisite.
	 * - 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
	 * - 'old' - returns tables which are deprecated.
	 *
	 * @since 3.0.0
	 * @since 6.1.0 `old` now includes deprecated multisite global tables only on multisite.
	 *
	 * @uses wpdb::$tables
	 * @uses wpdb::$old_tables
	 * @uses wpdb::$global_tables
	 * @uses wpdb::$ms_global_tables
	 * @uses wpdb::$old_ms_global_tables
	 *
	 * @param string $scope   Optional. Possible values include 'all', 'global', 'ms_global', 'blog',
	 *                        or 'old' tables. Default 'all'.
	 * @param bool   $prefix  Optional. Whether to include table prefixes. If blog prefix is requested,
	 *                        then the custom users and usermeta tables will be mapped. Default true.
	 * @param int    $blog_id Optional. The blog_id to prefix. Used only when prefix is requested.
	 *                        Defaults to `wpdb::$blogid`.
	 * @return string[] 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;
				if ( is_multisite() ) {
					$tables = array_merge( $tables, $this->old_ms_global_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, true ) ) {
					$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 or provided database connection.
	 *
	 * The database name will be changed based on the current database connection.
	 * On failure, the execution will bail and display a DB error.
	 *
	 * @since 0.71
	 *
	 * @param string $db  Database name.
	 * @param mysqli $dbh Optional. Database connection.
	 *                    Defaults to the current database handle.
	 */
	public function select( $db, $dbh = null ) {
		if ( is_null( $dbh ) ) {
			$dbh = $this->dbh;
		}

$success = mysqli_select_db( $dbh, $db );

if ( ! $success ) {
			$this->ready = false;
			if ( ! did_action( 'template_redirect' ) ) {
				wp_load_translations_early();

$message = '<h1>' . __( 'Cannot select database' ) . "</h1>\n";

$message .= '<p>' . sprintf(
					/* translators: %s: Database name. */
					__( 'The database server could be connected to (which means your username and password is okay) but the %s database could not be selected.' ),
					'<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 do not 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 $data
	 * @return string
	 */
	public function _weak_escape( $data ) {
		if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) {
			_deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' );
		}
		return addslashes( $data );
	}

/**
	 * Real escape using mysqli_real_escape_string().
	 *
	 * @since 2.8.0
	 *
	 * @see mysqli_real_escape_string()
	 *
	 * @param string $data String to escape.
	 * @return string Escaped string.
	 */
	public function _real_escape( $data ) {
		if ( ! is_scalar( $data ) ) {
			return '';
		}

if ( $this->dbh ) {
			$escaped = mysqli_real_escape_string( $this->dbh, $data );
		} else {
			$class = get_class( $