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                ```php <?php /** * 行為型模式 * * php訪問者模式 * * 說說我對的策略模式和訪問者模式的區分: * 乍一看,其實兩者都挺像的,都是實體類依賴了外部實體的算法,但是: * 對于策略模式:首先你是有一堆算法,然后在不同的邏輯中去使用; * 對于訪問者模式:實體的【結構是穩定的】,但是結構中元素的算法卻是多變的,比如就像人吃飯這個動作 * 是穩定不變的,但是具體吃的行為卻又是多變的; * * @author TIGERB <https://github.com/TIGERB> * @example 運行 php test.php */ // 注冊自加載 spl_autoload_register('autoload'); function autoload($class) { require dirname($_SERVER['SCRIPT_FILENAME']) . '//..//' . str_replace('\\', '/', $class) . '.php'; } /************************************* test *************************************/ use visitor\Person; use visitor\VisitorAsia; use visitor\VisitorAmerica; // 生產一個人的實例 $person = new Person(); // 來到了亞洲 $person->eat(new VisitorAsia()); // 來到了美洲 $person->eat(new VisitorAmerica());
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