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                ## 5-1 工廠模式 創建1個文件:*D:\wamp\www\demo\oop\framework\Think\Factory.php* ~~~ <?php namespace Think; class Factory { static function createDatabase() { return new Database(); } } ~~~ 定義了一個 `Factory` 類,定義一個方法:`createDatabase()`,然后在入口文件中調用: *D:\wamp\www\demo\oop\framework\index.php* ~~~ <?php // 入口文件 define('BASEDIR', __DIR__); include BASEDIR . '/Think/Loder.php'; spl_autoload_register('\\Think\\Loder::autoload'); // $obj = new Think\Database(); $obj = Think\Factory::createDatabase(); var_dump($obj); ~~~ 使用工廠模式取代了傳統的 `new` 的好處是:如果實例化的類名發生了變化,只需要修改工廠方法即可。
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