策略模式：
将一组特定的行为和算法封装成类，以适应某些特定的上下文环境；
实际应用举例，假如一个电商网站系统，针对男性女性用户要各自跳转到不同的商品类目，并且所有广告位展示不同的广告。
UserStrategy.php
<?<span>phpnamespace Baobab;</span><span>interface</span><span> UserStrategy{ </span><span>function</span><span> showAd(); </span><span>function</span><span> showCategory();}</span>?>
FemaleUserStrategy.php
<?<span>phpnamespace 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>phpnamespace 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>?>
Page.php
<span><span>namespace Baobab;</span><br /><b>6本文来源gao@dai!ma.com搞$代^码!网7</b><pre>搞gaodaima代码
class Page{ protected$strategy; function Index(){ $this->strategy->showAd(); echo ‘
‘; $this->strategy->showCategory(); } function setStrategy(\Baobab\UserStrategy $strategy){ $this->strategy = $strategy; }}
index.php
<span>$page</span> = <span>new</span><span> Baobab\Page();</span><span>if</span> (<span>isset</span>(<span>$_GET</span>['female'<span>])){ </span><span>$strategy</span> = <span>new</span><span> Baobab\FemaleUserStrategy();}</span><span>else</span><span>{ </span><span>$strategy</span> = <span>new</span><span> Baobab\MaleUserStrategy();}</span><span>$page</span>->setStrategy(<span>$strategy</span><span>);</span><span>$page</span>->Index();
使用策略模式可实现Ioc，依赖倒置、控制反转
以上就介绍了php设计模式 策略模式，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
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转载请注明原文链接：php设计模式 策略模式
