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                ## 工廠模式 #### 特點: 將調用對象與創建對象分離,調用者直接向工廠請求,減少代碼的耦合.提高系統的可維護性與可擴展性。 #### 應用場景: 提供一種類,具有為您創建對象的某些方法,這樣就可以使用工廠類創建對象,而不直接使用new。這樣如果想更改創建的對象類型,只需更改該工廠即可。 ``` //假設3個待實例化的類 class Aclass { } class Bclass { } class Cclass { } class Factory { //定義每個類的類名 const ACLASS = 'Aclass'; const BCLASS = 'Bclass'; const CCLASS = 'Cclass'; public static function getInstance($newclass) { $class = $newclass;//真實項目中這里常常是用來解析路由,加載文件。 return new $class; } } //調用方法: Factory::getInstance(Factory::ACLASS); ```
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