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PHP接口特性的实例讲解

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Release: 2016-06-13 11:06:04
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我们在通过学习VideoCard.php 接口文件(显卡的功能接口定义)

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class=""><span>interface VideoCardInter{  </span></li>
<li class="alt"><span>    function Display();  </span></li>
<li class=""><span>    function getName();  </span></li>
<li class="alt"><span>}  </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>
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Dmeng.php 实现接口(帝盟的厂家实现了这些接口,怎么实现的,主板厂家不用管)

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class=""><span>include_once("VideoCard.php");  </span></li>
<li class="alt"><span>class Dmeng implements VideoCardInter {  </span></li>
<li class=""><span>    function Display(){  </span></li>
<li class="alt"><span>        echo "Display";  </span></li>
<li class=""><span>    }  </span></li>
<li class="alt"><span>    function getName(){  </span></li>
<li class=""><span>        return "Dmeng VideoCard";  </span></li>
<li class="alt"><span>    }  </span></li>
<li class=""><span>}  </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>
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Mainboard.php  应用接口(把显卡插到主板上,主板只要用这些接口就行了,也可以不用)

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class=""><span>include_once("VideoCard.php");  </span></li>
<li class="alt"><span>include_once("Dmeng.php");  </span></li>
<li class=""><span>class Mainboard{  </span></li>
<li class="alt"><span>    var $vc;  </span></li>
<li class=""><span>    function run(VideoCardInter $vc){  //定义VideoCardInter接口类型参数,这时并不知道是谁来实现。  </span></li>
<li class="alt">
<span>        $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">vc</font></span><span>=$vc;  </span>
</li>
<li class="">
<span>        $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>vc-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Display();  </span>
</li>
<li class="alt"><span>        echo "主板运行!";  </span></li>
<li class=""><span>    }  </span></li>
<li class="alt"><span>}  </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">conputer</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">new</font></span><span> Mainboard();  </span>
</li>
<li class="alt">
<span>$conputer-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>run(new Dmeng);  //用的时候把实现接口类的名称写进来,<br>(现在是帝盟的显卡,也可以换成别的场家的,只要他们都实现了接口)  </span>
</li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>
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由于PHP是动态语言,所以类型不能像JAVA一样定的很死,定义接口的时候,写上返回类型反而出错,估计PHP6的时候可能写义的要严格一些吧。

PS:我只把PHP接口特性最基本的部分写上,还可以加CPU等接口。


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