/** * Main Instance. * * Ensures only one instance of this class is loaded or can be loaded. * * @since 1.5 * @access public * @static * @param object|bool $caller The referrer class * @return VAA_View_Admin_As_Role_Defaults|bool */ public static function get_instance($caller = false) { if (is_object($caller) && 'VAA_View_Admin_As' == get_class($caller)) { if (is_null(self::$_instance)) { self::$_instance = new self(); } return self::$_instance; } return false; }