lithium\util\collection\Filters::hasApplied PHP Method

    public static function hasApplied($class, $method)
    {
        return isset(static::$_lazyFilters[$class][$method]);
    }

 /**
  * Executes a set of filters against a method by taking a method's main implementation as a
  * callback, and iteratively wrapping the filters around it.
  *
  * @see lithium\util\collection\Filters
  * @param string|array $method The name of the method being executed, or an array containing
  *        the name of the class that defined the method, and the method name.
  * @param array $params An associative array containing all the parameters passed into
  *        the method.
  * @param Closure $callback The method's implementation, wrapped in a closure.
  * @param array $filters Additional filters to apply to the method for this call only.
  * @return mixed
  */
 protected static function _filter($method, $params, $callback, $filters = array())
 {
     $class = get_called_class();
     $hasNoFilters = empty(static::$_methodFilters[$class][$method]);
     if ($hasNoFilters && !$filters && !Filters::hasApplied($class, $method)) {
         return $callback($class, $params, null);
     }
     if (!isset(static::$_methodFilters[$class][$method])) {
         static::$_methodFilters += array($class => array());
         static::$_methodFilters[$class][$method] = array();
     }
     $data = array_merge(static::$_methodFilters[$class][$method], $filters, array($callback));
     return Filters::run($class, $params, compact('data', 'class', 'method'));
 }