<?php
 namespace TechOnline\Utils\Filter; class ArrayFilter implements Filter { const NAME = 'array'; private $map = array(); public static function build() { return new ArrayFilter(); } public function save($file) { file_put_contents($file, serialize($this->map)); } public function restore($file) { $data = file_get_contents($file); $this->map = unserialize($data); } public function add($key) { $this->map[$key] = true; } public function has($key) { return !empty($this->map[$key]); } }