private static function arrayRecursiveMerge($array1, $array2) {

		if(false === is_array($array1) || false === is_array($array2)) { 
			return $array2; 
		}

		foreach($array2 as $key => $value) {
			$array1[$key] = static :: arrayRecursiveMerge(@$array1[$key], $value);
		}

		return $array1;
	}