Mysqldump custom socket path

Hello again,

I send you the code of the modified function to handle a custom socket path configuration:

public function mysqldump() {

		$this->mysqldump_method = 'mysqldump';

		$this->do_action( 'hmbkp_mysqldump_started' );

		$host = explode( ':', DB_HOST );

		$host = reset( $host );
		$port = strpos( DB_HOST, ':' ) ? end( explode( ':', DB_HOST ) ) : '';
		$socket = strpos( DB_HOST, ':' ) ? end( explode( ':', DB_HOST ) ) : '';

		// Path to the mysqldump executable
		$cmd = escapeshellarg( $this->get_mysqldump_command_path() );

		// We don't want to create a new DB
		$cmd .= ' --no-create-db';

		// Allow lock-tables to be overridden
		if ( ! defined( 'HMBKP_MYSQLDUMP_SINGLE_TRANSACTION' ) || HMBKP_MYSQLDUMP_SINGLE_TRANSACTION !== false )
			$cmd .= ' --single-transaction';

		// Make sure binary data is exported properly
		$cmd .= ' --hex-blob';

		// Username
		$cmd .= ' -u ' . escapeshellarg( DB_USER );

		// Don't pass the password if it's blank
		if ( DB_PASSWORD )
			$cmd .= ' -p' . escapeshellarg( DB_PASSWORD );

		// Set the host
		$cmd .= ' -h ' . escapeshellarg( $host );

		// Set the port if it was set
		if ( ! empty( $port ) && is_numeric( $port ) )
			$cmd .= ' -P ' . $port;

		// Set the socket path
		if ( ! empty( $socket ) && !is_numeric( $socket ) )
			$cmd .= ' --protocol=socket -S ' . $socket;

		// The file we're saving too
		$cmd .= ' -r ' . escapeshellarg( $this->get_database_dump_filepath() );

		// The database we're dumping
		$cmd .= ' ' . escapeshellarg( DB_NAME );

		// Pipe STDERR to STDOUT
		$cmd .= ' 2>&1';

		// Store any returned data in an error
		$stderr = shell_exec( $cmd );

		// Skip the new password warning that is output in mysql > 5.6 (@see http://bugs.mysql.com/bug.php?id=66546)
		if ( trim( $stderr ) === 'Warning: Using a password on the command line interface can be insecure.' ) {
			$stderr = '';
		}

		if ( $stderr ) {
			$this->error( $this->get_mysqldump_method(), $stderr );
		}

		$this->verify_mysqldump();

	}