protected static function _getMimeExtensionMap()
    {
        if (is_null(self::$_map)) {
            require __DIR__ . '/mime.mapping.php';
            self::$_map = $mime_extension_map;
        }

        return self::$_map;
    }
protected static function _getMimeExtensionMap()
    {
        if (is_null(self::$_map)) {
            require __DIR__ . '/mime.mapping.php';
            self::$_map = $mime_extension_map;
        }

        return self::$_map;
    }
protected static function _getMimeExtensionMap ( ) { if ( is_null ( self :: $ _map ) ) { require __DIR__ . '/mime.mapping.php' ; self :: $ _map = $ mime_extension_map ; } return self :: $ _map ; }
Returns a copy of the MIME extension map.

@return array  The MIME extension map.
Returns a copy of the MIME extension map .