/Modifications Since 08/www/wp-includes/wp-db.php
PHP | 994 lines | 373 code | 111 blank | 510 comment | 74 complexity | 8f36d562f05263624fc9b76150cbdbcf MD5 | raw file
- <?php
- /**
- * WordPress DB Class
- *
- * Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}
- *
- * @package WordPress
- * @subpackage Database
- * @since 0.71
- */
- /**
- * @since 0.71
- */
- define('EZSQL_VERSION', 'WP1.25');
- /**
- * @since 0.71
- */
- define('OBJECT', 'OBJECT', true);
- /**
- * @since {@internal Version Unknown}}
- */
- define('OBJECT_K', 'OBJECT_K', false);
- /**
- * @since 0.71
- */
- define('ARRAY_A', 'ARRAY_A', false);
- /**
- * @since 0.71
- */
- define('ARRAY_N', 'ARRAY_N', false);
- /**
- * WordPress Database Access Abstraction Object
- *
- * It is possible to replace this class with your own
- * by setting the $wpdb global variable in wp-content/db.php
- * file with your class. You can name it wpdb also, since
- * this file will not be included, if the other file is
- * available.
- *
- * @link http://codex.wordpress.org/Function_Reference/wpdb_Class
- *
- * @package WordPress
- * @subpackage Database
- * @since 0.71
- * @final
- */
- class wpdb {
- /**
- * Whether to show SQL/DB errors
- *
- * @since 0.71
- * @access private
- * @var bool
- */
- var $show_errors = false;
- /**
- * Whether to suppress errors during the DB bootstrapping.
- *
- * @access private
- * @since {@internal Version Unknown}}
- * @var bool
- */
- var $suppress_errors = false;
- /**
- * The last error during query.
- *
- * @since {@internal Version Unknown}}
- * @var string
- */
- var $last_error = '';
- /**
- * Amount of queries made
- *
- * @since 1.2.0
- * @access private
- * @var int
- */
- var $num_queries = 0;
- /**
- * Saved result of the last query made
- *
- * @since 1.2.0
- * @access private
- * @var array
- */
- var $last_query;
- /**
- * Saved info on the table column
- *
- * @since 1.2.0
- * @access private
- * @var array
- */
- var $col_info;
- /**
- * Saved queries that were executed
- *
- * @since 1.5.0
- * @access private
- * @var array
- */
- var $queries;
- /**
- * 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 0.71
- * @access private
- * @var string
- */
- var $prefix = '';
- /**
- * Whether the database queries are ready to start executing.
- *
- * @since 2.5.0
- * @access private
- * @var bool
- */
- var $ready = false;
- /**
- * WordPress Posts table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $posts;
- /**
- * WordPress Users table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $users;
- /**
- * WordPress Categories table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $categories;
- /**
- * WordPress Post to Category table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $post2cat;
- /**
- * WordPress Comments table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $comments;
- /**
- * WordPress Links table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $links;
- /**
- * WordPress Options table
- *
- * @since 1.5.0
- * @access public
- * @var string
- */
- var $options;
- /**
- * WordPress Post Metadata table
- *
- * @since {@internal Version Unknown}}
- * @access public
- * @var string
- */
- var $postmeta;
- /**
- * WordPress User Metadata table
- *
- * @since 2.3.0
- * @access public
- * @var string
- */
- var $usermeta;
- /**
- * WordPress Terms table
- *
- * @since 2.3.0
- * @access public
- * @var string
- */
- var $terms;
- /**
- * WordPress Term Taxonomy table
- *
- * @since 2.3.0
- * @access public
- * @var string
- */
- var $term_taxonomy;
- /**
- * WordPress Term Relationships table
- *
- * @since 2.3.0
- * @access public
- * @var string
- */
- var $term_relationships;
- /**
- * List of WordPress tables
- *
- * @since {@internal Version Unknown}}
- * @access private
- * @var array
- */
- var $tables = array('users', 'usermeta', 'posts', 'categories', 'post2cat', 'comments', 'links', 'link2cat', 'options',
- 'postmeta', 'terms', 'term_taxonomy', 'term_relationships');
- /**
- * Database table columns charset
- *
- * @since 2.2.0
- * @access public
- * @var string
- */
- var $charset;
- /**
- * Database table columns collate
- *
- * @since 2.2.0
- * @access public
- * @var string
- */
- var $collate;
- /**
- * Connects to the database server and selects a database
- *
- * PHP4 compatibility layer for calling the PHP5 constructor.
- *
- * @uses wpdb::__construct() Passes parameters and returns result
- * @since 0.71
- *
- * @param string $dbuser MySQL database user
- * @param string $dbpassword MySQL database password
- * @param string $dbname MySQL database name
- * @param string $dbhost MySQL database host
- */
- function wpdb($dbuser, $dbpassword, $dbname, $dbhost) {
- return $this->__construct($dbuser, $dbpassword, $dbname, $dbhost);
- }
- /**
- * 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.
- *
- * @since 2.0.8
- *
- * @param string $dbuser MySQL database user
- * @param string $dbpassword MySQL database password
- * @param string $dbname MySQL database name
- * @param string $dbhost MySQL database host
- */
- function __construct($dbuser, $dbpassword, $dbname, $dbhost) {
- register_shutdown_function(array(&$this, "__destruct"));
- if ( defined('WP_DEBUG') and WP_DEBUG == true )
- $this->show_errors();
- if ( defined('DB_CHARSET') )
- $this->charset = DB_CHARSET;
- if ( defined('DB_COLLATE') )
- $this->collate = DB_COLLATE;
- $this->dbh = @mysql_connect($dbhost, $dbuser, $dbpassword, true);
- if (!$this->dbh) {
- $this->bail(sprintf(/*WP_I18N_DB_CONN_ERROR*/"
- <h1>Error establishing a database connection</h1>
- <p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>%s</code>. This could mean your host's database server is down.</p>
- <ul>
- <li>Are you sure you have the correct username and password?</li>
- <li>Are you sure that you have typed the correct hostname?</li>
- <li>Are you sure that the database server is running?</li>
- </ul>
- <p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
- "/*/WP_I18N_DB_CONN_ERROR*/, $dbhost));
- return;
- }
- $this->ready = true;
- if ( $this->has_cap( 'collation' ) ) {
- $collation_query = '';
- if ( !empty($this->charset) ) {
- $collation_query = "SET NAMES '{$this->charset}'";
- if (!empty($this->collate) )
- $collation_query .= " COLLATE '{$this->collate}'";
- }
- if ( !empty($collation_query) )
- $this->query($collation_query);
- }
- $this->select($dbname);
- }
- /**
- * PHP5 style destructor and will run when database object is destroyed.
- *
- * @since 2.0.8
- *
- * @return bool Always true
- */
- function __destruct() {
- return true;
- }
- /**
- * Sets the table prefix for the WordPress tables.
- *
- * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
- * override the WordPress users and usersmeta tables.
- *
- * @since 2.5.0
- *
- * @param string $prefix Alphanumeric name for the new prefix.
- * @return string Old prefix
- */
- function set_prefix($prefix) {
- if ( preg_match('|[^a-z0-9_]|i', $prefix) )
- return new WP_Error('invalid_db_prefix', /*WP_I18N_DB_BAD_PREFIX*/'Invalid database prefix'/*/WP_I18N_DB_BAD_PREFIX*/);
- $old_prefix = $this->prefix;
- $this->prefix = $prefix;
- foreach ( (array) $this->tables as $table )
- $this->$table = $this->prefix . $table;
- if ( defined('CUSTOM_USER_TABLE') )
- $this->users = CUSTOM_USER_TABLE;
- if ( defined('CUSTOM_USER_META_TABLE') )
- $this->usermeta = CUSTOM_USER_META_TABLE;
- return $old_prefix;
- }
- /**
- * 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 $db MySQL database name
- * @return null Always null.
- */
- function select($db) {
- if (!@mysql_select_db($db, $this->dbh)) {
- $this->ready = false;
- $this->bail(sprintf(/*WP_I18N_DB_SELECT_DB*/'
- <h1>Can’t select database</h1>
- <p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$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 setup a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="http://wordpress.org/support/">WordPress Support Forums</a>.</p>'/*/WP_I18N_DB_SELECT_DB*/, $db, DB_USER));
- return;
- }
- }
- /**
- * Escapes content for insertion into the database, for security
- *
- * @since 0.71
- *
- * @param string $string
- * @return string query safe string
- */
- function escape($string) {
- return addslashes( $string );
- // Disable rest for now, causing problems
- /*
- if( !$this->dbh || version_compare( phpversion(), '4.3.0' ) == '-1' )
- return mysql_escape_string( $string );
- else
- return mysql_real_escape_string( $string, $this->dbh );
- */
- }
- /**
- * Escapes content by reference for insertion into the database, for security
- *
- * @since 2.3.0
- *
- * @param string $s
- */
- function escape_by_ref(&$s) {
- $s = $this->escape($s);
- }
- /**
- * Prepares a SQL query for safe use, using sprintf() syntax.
- *
- * @link http://php.net/sprintf See for syntax to use for query string.
- * @since 2.3.0
- *
- * @param null|string $args If string, first parameter must be query statement
- * @param mixed $args,... If additional parameters, they will be set inserted into the query.
- * @return null|string Sanitized query string
- */
- function prepare($args=null) {
- if ( is_null( $args ) )
- return;
- $args = func_get_args();
- $query = array_shift($args);
- $query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
- $query = str_replace('"%s"', '%s', $query); // doublequote unquoting
- $query = str_replace('%s', "'%s'", $query); // quote the strings
- array_walk($args, array(&$this, 'escape_by_ref'));
- return @vsprintf($query, $args);
- }
- /**
- * Print SQL/DB error.
- *
- * @since 0.71
- * @global array $EZSQL_ERROR Stores error information of query and error string
- *
- * @param string $str The error to display
- * @return bool False if the showing of errors is disabled.
- */
- function print_error($str = '') {
- global $EZSQL_ERROR;
- if (!$str) $str = mysql_error($this->dbh);
- $EZSQL_ERROR[] = array ('query' => $this->last_query, 'error_str' => $str);
- if ( $this->suppress_errors )
- return false;
- if ( $caller = $this->get_caller() )
- $error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR_FULL*/'WordPress database error %1$s for query %2$s made by %3$s'/*/WP_I18N_DB_QUERY_ERROR_FULL*/, $str, $this->last_query, $caller);
- else
- $error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR*/'WordPress database error %1$s for query %2$s'/*/WP_I18N_DB_QUERY_ERROR*/, $str, $this->last_query);
- $log_error = true;
- if ( ! function_exists('error_log') )
- $log_error = false;
- $log_file = @ini_get('error_log');
- if ( !empty($log_file) && ('syslog' != $log_file) && !@is_writable($log_file) )
- $log_error = false;
- if ( $log_error )
- @error_log($error_str, 0);
- // Is error output turned on or not..
- if ( !$this->show_errors )
- return false;
- $str = htmlspecialchars($str, ENT_QUOTES);
- $query = htmlspecialchars($this->last_query, ENT_QUOTES);
- // If there is an error then take note of it
- 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
- *
- * @param bool $show Whether to show or hide errors
- * @return bool Old value for showing errors.
- */
- function show_errors( $show = true ) {
- $errors = $this->show_errors;
- $this->show_errors = $show;
- return $errors;
- }
- /**
- * Disables showing of database errors.
- *
- * @since 0.71
- *
- * @return bool Whether showing of errors was active or not
- */
- function hide_errors() {
- $show = $this->show_errors;
- $this->show_errors = false;
- return $show;
- }
- /**
- * Whether to suppress database errors.
- *
- * @param unknown_type $suppress
- * @return unknown
- */
- function suppress_errors( $suppress = true ) {
- $errors = $this->suppress_errors;
- $this->suppress_errors = $suppress;
- return $errors;
- }
- /**
- * Kill cached query results.
- *
- * @since 0.71
- */
- function flush() {
- $this->last_result = array();
- $this->col_info = null;
- $this->last_query = null;
- }
- /**
- * Perform a MySQL database query, using current database connection.
- *
- * More information can be found on the codex page.
- *
- * @since 0.71
- *
- * @param string $query
- * @return unknown
- */
- function query($query) {
- if ( ! $this->ready )
- return false;
- // filter the query, if filters are available
- // NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
- if ( function_exists('apply_filters') )
- $query = apply_filters('query', $query);
- // initialise return
- $return_val = 0;
- $this->flush();
- // Log how the function was called
- $this->func_call = "\$db->query(\"$query\")";
- // Keep track of the last query for debug..
- $this->last_query = $query;
- // Perform the query via std mysql_query function..
- if ( defined('SAVEQUERIES') && SAVEQUERIES )
- $this->timer_start();
- $this->result = @mysql_query($query, $this->dbh);
- ++$this->num_queries;
- if ( defined('SAVEQUERIES') && SAVEQUERIES )
- $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
- // If there is an error then take note of it..
- if ( $this->last_error = mysql_error($this->dbh) ) {
- $this->print_error();
- return false;
- }
- if ( preg_match("/^\\s*(insert|delete|update|replace|alter) /i",$query) ) {
- $this->rows_affected = mysql_affected_rows($this->dbh);
- // Take note of the insert_id
- if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
- $this->insert_id = mysql_insert_id($this->dbh);
- }
- // Return number of rows affected
- $return_val = $this->rows_affected;
- } else {
- $i = 0;
- while ($i < @mysql_num_fields($this->result)) {
- $this->col_info[$i] = @mysql_fetch_field($this->result);
- $i++;
- }
- $num_rows = 0;
- while ( $row = @mysql_fetch_object($this->result) ) {
- $this->last_result[$num_rows] = $row;
- $num_rows++;
- }
- @mysql_free_result($this->result);
- // Log number of rows the query returned
- $this->num_rows = $num_rows;
- // Return number of rows selected
- $return_val = $this->num_rows;
- }
- return $return_val;
- }
- /**
- * Insert an array of data into a table.
- *
- * @since 2.5.0
- *
- * @param string $table WARNING: not sanitized!
- * @param array $data Should not already be SQL-escaped
- * @return mixed Results of $this->query()
- */
- function insert($table, $data) {
- $data = add_magic_quotes($data);
- $fields = array_keys($data);
- return $this->query("INSERT INTO $table (`" . implode('`,`',$fields) . "`) VALUES ('".implode("','",$data)."')");
- }
- /**
- * Update a row in the table with an array of data.
- *
- * @since 2.5.0
- *
- * @param string $table WARNING: not sanitized!
- * @param array $data Should not already be SQL-escaped
- * @param array $where A named array of WHERE column => value relationships. Multiple member pairs will be joined with ANDs. WARNING: the column names are not currently sanitized!
- * @return mixed Results of $this->query()
- */
- function update($table, $data, $where){
- $data = add_magic_quotes($data);
- $bits = $wheres = array();
- foreach ( (array) array_keys($data) as $k )
- $bits[] = "`$k` = '$data[$k]'";
- if ( is_array( $where ) )
- foreach ( $where as $c => $v )
- $wheres[] = "$c = '" . $this->escape( $v ) . "'";
- else
- return false;
- return $this->query( "UPDATE $table SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres ) );
- }
- /**
- * Retrieve one variable from the database.
- *
- * This combines the functionality of wpdb::get_row() and wpdb::get_col(),
- * so both the column and row can be picked.
- *
- * It is possible to use this function without executing more queries. If
- * you already made a query, you can set the $query to 'null' value and just
- * retrieve either the column and row of the last query result.
- *
- * @since 0.71
- *
- * @param string $query Can be null as well, for caching
- * @param int $x Column num to return
- * @param int $y Row num to return
- * @return mixed Database query results
- */
- function get_var($query=null, $x = 0, $y = 0) {
- $this->func_call = "\$db->get_var(\"$query\",$x,$y)";
- 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.
- *
- * @since 0.71
- *
- * @param string $query SQL query
- * @param string $output ARRAY_A | ARRAY_N | OBJECT
- * @param int $y Row num to return
- * @return mixed Database query results
- */
- function get_row($query = null, $output = OBJECT, $y = 0) {
- $this->func_call = "\$db->get_row(\"$query\",$output,$y)";
- 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;
- } else {
- $this->print_error(/*WP_I18N_DB_GETROW_ERROR*/" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N"/*/WP_I18N_DB_GETROW_ERROR*/);
- }
- }
- /**
- * Retrieve one column from the database.
- *
- * @since 0.71
- *
- * @param string $query Can be null as well, for caching
- * @param int $x Col num to return. Starts from 0.
- * @return array Column results
- */
- function get_col($query = null , $x = 0) {
- if ( $query )
- $this->query($query);
- $new_array = array();
- // Extract the column values
- for ( $i=0; $i < count($this->last_result); $i++ ) {
- $new_array[$i] = $this->get_var(null, $x, $i);
- }
- return $new_array;
- }
- /**
- * Retrieve an entire result set from the database.
- *
- * @since 0.71
- *
- * @param string|null $query Can also be null to pull from the cache
- * @param string $output ARRAY_A | ARRAY_N | OBJECT_K | OBJECT
- * @return mixed Database query results
- */
- function get_results($query = null, $output = OBJECT) {
- $this->func_call = "\$db->get_results(\"$query\", $output)";
- if ( $query )
- $this->query($query);
- else
- return null;
- 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 ) {
- $key = array_shift( get_object_vars( $row ) );
- 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 ) {
- $i = 0;
- foreach( (array) $this->last_result as $row ) {
- if ( $output == ARRAY_N ) {
- // ...integer-keyed row arrays
- $new_array[$i] = array_values( get_object_vars( $row ) );
- } else {
- // ...column name-keyed row arrays
- $new_array[$i] = get_object_vars( $row );
- }
- ++$i;
- }
- return $new_array;
- }
- }
- }
- /**
- * Retrieve column metadata from the last query.
- *
- * @since 0.71
- *
- * @param string $info_type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
- * @param int $col_offset 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
- * @return mixed Column Results
- */
- function get_col_info($info_type = 'name', $col_offset = -1) {
- if ( $this->col_info ) {
- if ( $col_offset == -1 ) {
- $i = 0;
- 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 Always returns true
- */
- function timer_start() {
- $mtime = microtime();
- $mtime = explode(' ', $mtime);
- $this->time_start = $mtime[1] + $mtime[0];
- return true;
- }
- /**
- * Stops the debugging timer.
- *
- * @since 1.5.0
- *
- * @return int Total time spent on the query, in milliseconds
- */
- function timer_stop() {
- $mtime = microtime();
- $mtime = explode(' ', $mtime);
- $time_end = $mtime[1] + $mtime[0];
- $time_total = $time_end - $this->time_start;
- return $time_total;
- }
- /**
- * Wraps fatal errors in a nice header and footer and dies.
- *
- * @since 1.5.0
- *
- * @param string $message
- * @return unknown
- */
- function bail($message) {
- if ( !$this->show_errors ) {
- if ( class_exists('WP_Error') )
- $this->error = new WP_Error('500', $message);
- else
- $this->error = $message;
- return false;
- }
- wp_die($message);
- }
- /**
- * Whether or not MySQL database is minimal required version.
- *
- * @since 2.5.0
- * @uses $wp_version
- *
- * @return WP_Error
- */
- function check_database_version()
- {
- global $wp_version;
- // Make sure the server has MySQL 4.0
- if ( version_compare($this->db_version(), '4.0.0', '<') )
- return new WP_Error('database_version',sprintf(__('<strong>ERROR</strong>: WordPress %s requires MySQL 4.0.0 or higher'), $wp_version));
- }
- /**
- * Whether of not the database version supports collation.
- *
- * Called when WordPress is generating the table scheme.
- *
- * @since 2.5.0
- *
- * @return bool True if collation is supported, false if version does not
- */
- function supports_collation()
- {
- return $this->has_cap( 'collation' );
- }
- /**
- * Generic function to determine if a database supports a particular feature
- * @param string $db_cap the feature
- * @param false|string|resource $dbh_or_table the databaese (the current database, the database housing the specified table, or the database of the mysql resource)
- * @return bool
- */
- function has_cap( $db_cap ) {
- $version = $this->db_version();
- switch ( strtolower( $db_cap ) ) :
- case 'collation' : // @since 2.5.0
- case 'group_concat' : // @since 2.7
- case 'subqueries' : // @since 2.7
- return version_compare($version, '4.1', '>=');
- break;
- endswitch;
- return false;
- }
- /**
- * Retrieve the name of the function that called wpdb.
- *
- * Requires PHP 4.3 and 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
- */
- function get_caller() {
- // requires PHP 4.3+
- if ( !is_callable('debug_backtrace') )
- return '';
- $bt = debug_backtrace();
- $caller = array();
- $bt = array_reverse( $bt );
- foreach ( (array) $bt as $call ) {
- if ( @$call['class'] == __CLASS__ )
- continue;
- $function = $call['function'];
- if ( isset( $call['class'] ) )
- $function = $call['class'] . "->$function";
- $caller[] = $function;
- }
- $caller = join( ', ', $caller );
- return $caller;
- }
- /**
- * The database version number
- * @return false|string false on failure, version number on success
- */
- function db_version() {
- return preg_replace('/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ));
- }
- }
- if ( ! isset($wpdb) ) {
- /**
- * WordPress Database Object, if it isn't set already in wp-content/db.php
- * @global object $wpdb Creates a new wpdb object based on wp-config.php Constants for the database
- * @since 0.71
- */
- $wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
- }
- ?>