Updated method Phalcon\Fitler::add

phalcon/filter.zep

@@ -70,8 +70,8 @@ class Filter implements FilterInterface
 	 */
 	public function add(string! name, handler) -> <Filter>
 	{
-		if typeof handler != "object" {
-			throw new Exception("Filter must be an object");
+		if typeof handler != "object" && !is_callable(handler) {
+			throw new Exception("Filter must be an object or callable");
 		}
 
 		let this->_filters[name] = handler;
@@ -134,7 +134,7 @@ class Filter implements FilterInterface
 			/**
 			 * If the filter is a closure we call it in the PHP userland
 			 */
-			if filterObject instanceof \Closure {
+			if filterObject instanceof \Closure || is_callable(filterObject) {
 				return call_user_func_array(filterObject, [value]);
 			}