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Current File : /var/www/html/wp-content/plugins/backupbuddy/lib/wpdbutils/wpdbutils.php
<?php
/**
 *	pluginbuddy_wpdbutils Class
 *
 *  Provides utility functions for helping with WordPress database handling
 *	
 *	Version: 1.0.1
 *	Author:
 *	Author URI:
 *
 *  @param		$db			object		Mandatory WordPress database object which is the database to operate on
 *	@return		null
 *
 */
if ( !class_exists( "pluginbuddy_wpdbutils" ) ) {
	
	class pluginbuddy_wpdbutils {
		
		// status method type parameter values - would like a class for this
		const STATUS_TYPE_DETAILS = 'details';

		public $_version = '1.0.1';
		
		/**
		 * wpdb object 
		 * 
		 * @var wpdb
		 */
		protected $_db = NULL;
		
		/**
		* Whether or not mysqli is in use.
		*/
		protected $_using_mysqli = false;
		
		/**
		 * parent object
		 * 
		 * @var parent object
		 */
		protected $_parent = NULL;
		
		/**
		 * Whether or not we can call a status calback
		 * 
		 * @var have_status_callback bool
		 */
		protected $_have_status_callback = false;
		
		/**
		 * Object->method array for status function
		 * 
		 * @var status_callback array
		 */
		protected $_status_callback = array();
		
		
		/**
		 *	__construct()
		 *	
		 *	Default constructor. Sets up optional status() function linkage if applicable.
		 *	
		 *  @param		reference	&$db			[mandatory] Reference to the database object
		 *	@return		null
		 *
		 */
		public function __construct( &$db ) { // removed wpdb type hint Jan 9, 2013.
			
			$this->_db = &$db;
			
			// As of WP 3.9 mysqli may be used.
			if ( isset( $this->_db->use_mysqli ) && ( true === $this->_db->use_mysqli ) ) {
				$this->_using_mysqli = true;
				$type = 'mysqli';
			} else {
				$type = 'mysql';
			}
			
			pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, 'Database kicker loaded. Database object class: `' . get_class( $db ) . '` with database of type `' . $type . '`.' );
		}
		
		
		/**
		 *	__destruct()
		 *	
		 *	Default destructor.
		 *	
		 *	@return		null
		 *
		 */
		public function __destruct( ) {

		}
		
		
		/**
		 *	kick()
		 *	
		 *	Kicks the database to see if the conenction is still alive and if it isn't then tries to reconnect
		 *	
		 *	@return		true if connection alive (may have been reconnected), false otherwise (dead and couldn't be reconnected)
		 *
		 */
		public function kick( ) {
			
			// Initialize result to assume failure
			$result = false; 
			
			// Use ping to check if server is still present - note will not reconnect automatically for MySQL >= 5.0.13
			// and actually we don't want it to as that is bad karma
			// mysqli added as of WP 3.9.
			if ( ! $this->_mysql_ping() ) {
				
				// Database connection appears to have gone away
				pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __('Database Server has gone away, attempting to reconnect.','it-l10n-backupbuddy' ) );
				
				// Close things down cleanly (from a local perspective)
				if ( true === $this->_using_mysqli ) {
					@mysqli_close( $this->_db->dbh );
				} else {
					@mysql_close( $this->_db->dbh );
				}
				unset( $this->_db->dbh);
				$this->_db->ready = false;
				
				// And attempt to reconnect
				$this->_db->db_connect();
				
				// Reconnect failed if we have a null resource or ping fails
				if ( ( NULL == $this->_db->dbh ) || ( ! $this->_mysql_ping() ) ) {
					
					// Reconnection failed, make sure user knows
					pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __('Database Server reconnection failed.','it-l10n-backupbuddy' ) );
						
					// Make sure failure is notified (no need to close things down locally as it's a wrap anyway)
					$result = false;
					
				} else {
					
					// Reconnection successful, make sure user knows
					pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __('Database Server reconnection successful.','it-l10n-backupbuddy' ) );
					$result = true;
					
				}
				
			} else { // Ping went through; still connected.
				
				// Just to let user know that database is still connected
				pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __('Database Server connection status verified.','it-l10n-backupbuddy' ) );
				$result = true;
				
			}
			
			return $result;
		} // End kick().
		
		
		/* _mysql_ping()
		 *
		 * Ping mysql or mysqli as applicable.
		 * @return	bool		Returns mysql[i] ping function response. (True on ping success, else false).
		 */
		private function _mysql_ping() {
			
			if ( true === $this->_using_mysqli ) {
				pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __( 'Pinging mysqli.', 'it-l10n-backupbuddy' ) );
				return mysqli_ping( $this->_db->dbh );
			} else {
				pb_backupbuddy::status( self::STATUS_TYPE_DETAILS, __( 'Pinging mysql.', 'it-l10n-backupbuddy' ) );
				return mysql_ping( $this->_db->dbh );
			}
			
		} // End _mysql_ping().
		
		
	} // end pluginbuddy_wpdbutils class.
	
} // end if !class_exists.

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