php設計模式的六大原則（五）：依賴倒置原則

依賴倒置原則（DSP）

 run();}}class Client{public static function doing(){$driver = new Driver();$driver -> drive( new Benz() );}}Client :: doing();// 那麼如果司機想開寶馬呢？，是不是就要修改Driver了，這就違反了開閉原則了，怎麼能只在Client添加代碼就讓寶馬車也會開呢？interface ICar{//定義一個汽車介面public function run();}class BMW implements ICar{public function run(){return "BMW is runing !!!";}}class Benz implements ICar{public function run(){return "Benz is runing !!!";}}interface IDriver{//定義一個司機介面，以防以後有A照，B照，C照的public function drive(ICar $car);}class Driver implements IDriver{public function drive(ICar $car){echo "
" . $car -> run();}}class Client{public static function doing(){$driver = new Driver();$driver -> drive( new BMW() ); //開寶馬$driver -> drive( new Benz() ); //開平治        .        .        .        .}}Client :: doing();?>

這麼簡單，學會了吧？依賴倒置原則核心一句話：面向介面編程。

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