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                ```php <?php /** * 行為型模式 * * php備忘錄模式 * 理解:就是外部存儲對象的狀態,以提供后退/恢復/復原 * 使用場景:編輯器后退操作/數據庫事物/存檔 * * 下面我們來實現編輯器的undo(撤銷)/redo(重置)功能 * * @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 memento\Editor; try { // 初始化一個編輯器并新建一個空文件 $editor = new Editor(''); // 寫入一段文本 $editor->write('hello php !'); // 保存 $editor->save(); // 修改剛才的文本 $editor->write(' no code no life !'); // 撤銷 $editor->undo(); $editor->read(); // 再次修改并保存文本 $editor->write(' life is a struggle !'); $editor->save(); // 重置 $editor->redo(); $editor->read(); } catch (\Exception $e) { echo 'error:' . $e->getMessage(); }
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