php設計模式 策略模式

策略模式：

將一組特定的行為和演算法封裝成類，以適應某些特定的上下文環境；

實際應用舉例，假如一個電商網站系統，針對男性女性用戶要各自跳到不同的商品類目，且所有廣告位展示不同的廣告。

UserStrategy.php

<?<span>php
namespace Baobab;

</span><span>interface</span><span> UserStrategy{
    </span><span>function</span><span> showAd();
    </span><span>function</span><span> showCategory();
}
</span>?>

FemaleUserStrategy.php

<?<span>php
namespace Baobab;

</span><span>class</span> FemaleUserStrategy <span>implements</span><span> UserStrategy{
    </span><span>function</span><span> showAd(){
        </span><span>echo</span> '2016新款女装'<span>;
    }
    </span><span>function</span><span> showCategory(){
        </span><span>echo</span> '女装'<span>;
    }
}

</span>?>

MaleUserStrategy.php

<?<span>php
namespace Baobab;

</span><span>class</span> MaleUserStrategy <span>implements</span><span> UserStrategy{
    </span><span>function</span><span> showAd(){
        </span><span>echo</span> 'Iphone6s plus'<span>;
    }
    </span><span>function</span><span> showCategory(){
        </span><span>echo</span> '电子产品'<span>;
    }
}

</span>?>

MaleUserStrategy.

<span><span>namespace Baobab;</span><br>class</span><span> Page{
     </span><span>protected</span><span>$strategy</span><span>;
     </span><span>function</span><span> Index(){
         </span><span>$this</span>->strategy-><span>showAd();
         </span><span>echo</span> '<br/>'<span>;
         </span><span>$this</span>->strategy-><span>showCategory();
     }
     </span><span>function</span> setStrategy(\Baobab\UserStrategy <span>$strategy</span><span>){
         </span><span>$this</span>->strategy = <span>$strategy</span><span>;
     }
}
</span>

使用策略模式可實現Ioc，依賴倒置、控制反轉

以上就介紹了php設計模式 策略模式，包含了面向的內容，希望對PHP教學有興趣的朋友有幫助。