We were able to connect to the database server (which means your username and password is okay) but not able to select the %1$s database.
%2$s have permission to use the %1$s database?username_%1$s. Could that be the problem?If you don\'t know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.
' ), 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( '|(?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( $this->last_query, ENT_QUOTES ); print "WordPress database error: [$str]
$query
This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at %s. This could mean your host's database server is down.
If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.
" ), htmlspecialchars( $this->dbhost, ENT_QUOTES ) ), '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; } /** * Check 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 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|null True if the connection is up. */ public function check_connection( $allow_bail = true ) { if ( $this->use_mysqli ) { if ( @mysqli_ping( $this->dbh ) ) { return true; } } else { if ( @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; } // We weren't able to reconnect, so we better bail. $this->bail( sprintf( ( "This means that we lost contact with the database server at %s. This could mean your host's database server is down.
If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.
" ), htmlspecialchars( $this->dbhost, ENT_QUOTES ) ), '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|false Number of rows affected/selected or false on error */ public function query( $query ) { if ( ! $this->ready ) { $this->check_current_query = true; return false; } /** * Filter 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 ) { $mysql_errno = mysqli_errno( $this->dbh ); } else { $mysql_errno = mysql_errno( $this->dbh ); } } 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 ) { $this->last_error = mysqli_error( $this->dbh ); } else { $this->last_error = mysql_error( $this->dbh ); } 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 * * @access private * @see wpdb::query() * * @param string $query The query to run. */ private function _do_query( $query ) { if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->timer_start(); } if ( $this->use_mysqli ) { $this->result = @mysqli_query( $this->dbh, $query ); } else { $this->result = @mysql_query( $query, $this->dbh ); } $this->num_queries++; if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() ); } } /** * Insert a row into a table. * * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) * * @since 2.5.0 * @see wpdb::prepare() * @see wpdb::$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). * @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). * @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 $type argument. * * @access private * @since 3.0.0 * @see wpdb::prepare() * @see wpdb::$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). * @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' ) { if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) ) { return false; } $data = $this->process_fields( $table, $data, $format ); if ( false === $data ) { return false; } $formats = $values = array(); foreach ( $data as $value ) { $formats[] = $value['format']; $values[] = $value['value']; } $fields = '`' . implode( '`, `', array_keys( $data ) ) . '`'; $formats = implode( ', ', $formats ); $sql = "$type INTO `$table` ($fields) VALUES ($formats)"; $this->insert_id = 0; $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). * @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". * @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 = $conditions = $values = array(); foreach ( $data as $field => $value ) { $fields[] = "`$field` = " . $value['format']; $values[] = $value['value']; } foreach ( $where as $field => $value ) { $conditions[] = "`$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". * @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 = $values = array(); foreach ( $where as $field => $value ) { $conditions[] = "`$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 * @access protected * * @param string $table Table name. * @param array $data Field/value pair. * @param mixed $format Format for each field. * @return array|bool 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 * @access protected * * @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 = $original_formats = (array) $format; 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 * @access protected * * @param array $data As it comes from the wpdb::process_field_formats() method. * @param string $table Table name. * @return 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 it's sprintf() could take more. $value['charset'] = false; } elseif ( $this->check_ascii( $value['value'] ) ) { // If it's ASCII, then we don't need the charset. We can skip this field. $value['charset'] = false; } else { $value['charset'] = $this->get_col_charset( $table, $field ); if ( is_wp_error( $value['charset'] ) ) { return false; } // This isn't ASCII. Don't have strip_invalid_text() re-check. $value['ascii'] = false; } $data[ $field ] = $value; } return $data; } /** * For string fields, record the maximum string length that field can safely save. * * @since 4.2.1 * @access protected * * @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 it's sprintf() could take more. $value['length'] = false; } else { $value['length'] = $this->get_col_length( $table, $field ); if ( is_wp_error( $value['length'] ) ) { return false; } } if ( false !== $value['length'] && mb_strlen( $value['value'] ) > $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_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. one of ARRAY_A | ARRAY_N | OBJECT constants. Return an associative array (column => value, ...), * a numerically indexed array (0 => value, ...) or an object ( ->column = value ), respectively. * @param int $y Optional. Row to return. Indexed from 0. * @return mixed 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_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_safe_collation( $query ) ) { $this->check_current_query = false; } if ( $query ) { $this->query( $query ); } $new_array = array(); // Extract the column values 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 mixed Database query results */ public function get_results( $query = null, $output = OBJECT ) { $this->func_call = "\$db->get_results(\"$query\", $output)"; if ( $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) 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 * @access protected * * @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 ); /** * Filter 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 $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 = $columns = array(); $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 * @access public * * @param string $table Table name. * @param string $column Column name. * @return mixed 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 ); /** * Filter 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 $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 ( false === $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. * * @since 4.2.1 * @access public * * @param string $table Table name. * @param string $column Column name. * @return mixed Max column length as an int. False if the column has no * length. 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 ( false === $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 'binary': case 'char': case 'varbinary': case 'varchar': return $length; break; case 'tinyblob': case 'tinytext': return 255; // 2^8 - 1 break; case 'blob': case 'text': return 65535; // 2^16 - 1 break; case 'mediumblob': case 'mediumtext': return 16777215; // 2^24 - 1 break; case 'longblob': case 'longtext': return 4294967295; // 2^32 - 1 break; default: return false; } 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 * @access protected * * @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 * @access protected * * @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)\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 * @access protected * * @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 ) { // Some multibyte character sets that we can check in PHP. $mb_charsets = array( 'ascii' => 'ASCII', 'big5' => 'BIG-5', 'eucjpms' => 'eucJP-win', 'gb2312' => 'EUC-CN', 'ujis' => 'EUC-JP', 'utf32' => 'UTF-32', ); $supported_charsets = array(); if ( function_exists( 'mb_list_encodings' ) ) { $supported_charsets = mb_list_encodings(); } $db_check_string = false; foreach ( $data as &$value ) { $charset = $value['charset']; // Column isn't a string, or is latin1, which will will happily store anything. if ( false === $charset || 'latin1' === $charset ) { continue; } if ( ! is_string( $value['value'] ) ) { continue; } // ASCII is always OK. if ( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) ) { continue; } // Convert the text locally. if ( $supported_charsets ) { if ( isset( $mb_charsets[ $charset ] ) && in_array( $mb_charsets[ $charset ], $supported_charsets ) ) { $value['value'] = mb_convert_encoding( $value['value'], $mb_charsets[ $charset ], $mb_charsets[ $charset ] ); continue; } } // utf8 can be handled by regex, which is a bunch faster than a DB lookup. if ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) { $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 .= '){1,50} # ...one or more times ) | . # anything else /x'; $value['value'] = preg_replace( $regex, '$1', $value['value'] ); continue; } // We couldn't use any local conversions, send it to the DB. $value['db'] = $db_check_string = true; } unset( $value ); // Remove by reference. if ( $db_check_string ) { $queries = array(); foreach ( $data as $col => $value ) { if ( ! empty( $value['db'] ) ) { if ( ! isset( $queries[ $value['charset'] ] ) ) { $queries[ $value['charset'] ] = array(); } // Split the CONVERT() calls by charset, so we can make sure the connection is right $queries[ $value['charset'] ][ $col ] = $this->prepare( "CONVERT( %s USING {$value['charset']} )", $value['value'] ); unset( $data[ $col ]['db'] ); } } $connection_charset = $this->charset; foreach ( $queries as $charset => $query ) { if ( ! $query ) { continue; } // Change the charset to match the string(s) we're converting if ( $charset !== $connection_charset ) { $connection_charset = $charset; $this->set_charset( $this->dbh, $charset ); } $this->check_current_query = false; $row = $this->get_row( "SELECT " . implode( ', ', $query ), ARRAY_N ); if ( ! $row ) { $this->set_charset( $this->dbh, $connection_charset ); return new WP_Error( 'wpdb_strip_invalid_text_failure' ); } $cols = array_keys( $query ); $col_count = count( $cols ); for ( $ii = 0; $ii < $col_count; $ii++ ) { $data[ $cols[ $ii ] ]['value'] = $row[ $ii ]; } } // Don't forget to change the charset back! if ( $connection_charset !== $this->charset ) { $this->set_charset( $this->dbh ); } } return $data; } /** * Strips any invalid characters from the query. * * @since 4.2.0 * @access protected * * @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 ) { $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, ); $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 * @access public * * @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 ) || $this->check_ascii( $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, 'ascii' => false, ) ); $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 * @access protected * * @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 and use only 1,000 * chars of the query. */ $query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', substr( $query, 0, 1000 ) ); // 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)*(?:\s+FROM)?' . ')\s+`?([\w-]+)`?/is', $query, $maybe ) ) { return $maybe[1]; } // SHOW TABLE STATUS and SHOW TABLES if ( preg_match( '/^\s*(?:' . 'SHOW\s+TABLE\s+STATUS.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)' . '|SHOW\s+(?:FULL\s+)?TABLES.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)' . ')\W([\w-]+)\W/is', $query, $maybe ) ) { return $maybe[1]; } // 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+\(*\s*`?([\w-]+)`?\s*\)*/is', $query, $maybe ) ) { return $maybe[1]; } return false; } /** * Load the column metadata from the last query. * * @since 3.5.0 * * @access protected */ protected function load_col_info() { if ( $this->col_info ) return; if ( $this->use_mysqli ) { for ( $i = 0; $i < @mysqli_num_fields( $this->result ); $i++ ) { $this->col_info[ $i ] = @mysqli_fetch_field( $this->result ); } } else { for ( $i = 0; $i < @mysql_num_fields( $this->result ); $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 bool */ 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 ) { if ( class_exists( 'WP_Error' ) ) $this->error = new WP_Error($error_code, $message); else $this->error = $message; return false; } wp_die($message); } /** * Whether MySQL database is at least the required minimum version. * * @since 2.5.0 * @uses $wp_version * @uses $required_mysql_version * * @return WP_Error */ 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(), $required_mysql_version, '<') ) return new WP_Error('database_version', sprintf( __( 'ERROR: WordPress %1$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. * * @since 2.5.0 * @deprecated 3.5.0 * @deprecated Use wpdb::has_cap( 'collation' ) * * @return bool True if collation is supported, false if version does not */ public function supports_collation() { _deprecated_function( __FUNCTION__, '3.5', '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 Support was added for the 'utf8mb4' feature. * * @see wpdb::db_version() * * @param string $db_cap The feature to check for. Accepts 'collation', * 'group_concat', 'subqueries', 'set_charset', * or 'utf8mb4'. * @return bool 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', '>=' ); } } 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 The name of the calling function */ public function get_caller() { return wp_debug_backtrace_summary( __CLASS__ ); } /** * The database version number. * * @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 ); } }