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php组合 - w&y

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May 20, 2016 am 10:14 AM

为了提高代码的复用性，降低代码的耦合（组合实现的两种方式）

模式一：

<span style="color: #008080;"> 1</span> <span style="color: #000000;">php
</span><span style="color: #008080;"> 2</span> <span style="color: #008000;">//</span><span style="color: #008000;">组合模式一</span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Person{
</span><span style="color: #008080;"> 4</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> eat(){
</span><span style="color: #008080;"> 5</span>         <span style="color: #0000ff;">echo</span> "eat.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;"> 6</span> <span style="color: #000000;">    }
</span><span style="color: #008080;"> 7</span> <span style="color: #000000;">}
</span><span style="color: #008080;"> 8</span> 
<span style="color: #008080;"> 9</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Phone{
</span><span style="color: #008080;">10</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> call(){
</span><span style="color: #008080;">11</span>         <span style="color: #0000ff;">echo</span> "phone call.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;">12</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">13</span> <span style="color: #000000;">}
</span><span style="color: #008080;">14</span> 
<span style="color: #008080;">15</span> <span style="color: #008000;">//</span><span style="color: #008000;">学生也需要call()这个方法，为了提高代码的复用性(组合)</span>
<span style="color: #008080;">16</span> <span style="color: #0000ff;">class</span> Student <span style="color: #0000ff;">extends</span><span style="color: #000000;"> Person{
</span><span style="color: #008080;">17</span>     <span style="color: #0000ff;">private</span> <span style="color: #800080;">$people</span><span style="color: #000000;">;
</span><span style="color: #008080;">18</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> learning(){
</span><span style="color: #008080;">19</span>         <span style="color: #0000ff;">echo</span> "learn.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;">20</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">21</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> func(<span style="color: #800080;">$class</span>, <span style="color: #800080;">$method</span>){<span style="color: #008000;">//</span><span style="color: #008000;">兼容多个类的多个方法</span>
<span style="color: #008080;">22</span>         <span style="color: #800080;">$this</span>->people = <span style="color: #0000ff;">new</span> <span style="color: #800080;">$class</span><span style="color: #000000;">;
</span><span style="color: #008080;">23</span>         <span style="color: #800080;">$this</span>->people-><span style="color: #800080;">$method</span><span style="color: #000000;">();
</span><span style="color: #008080;">24</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">25</span> <span style="color: #000000;">}
</span><span style="color: #008080;">26</span> 
<span style="color: #008080;">27</span> <span style="color: #800080;">$student</span> = <span style="color: #0000ff;">new</span><span style="color: #000000;"> Student();
</span><span style="color: #008080;">28</span> <span style="color: #800080;">$student</span>-><span style="color: #000000;">eat();
</span><span style="color: #008080;">29</span> <span style="color: #800080;">$student</span>->func('Phone', 'call'<span style="color: #000000;">);
</span><span style="color: #008080;">30</span> <span style="color: #800080;">$student</span>->learning();

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模式二：

<span style="color: #008080;"> 1</span> <span style="color: #000000;">php
</span><span style="color: #008080;"> 2</span> <span style="color: #008000;">//</span><span style="color: #008000;">组合模式二</span>
<span style="color: #008080;"> 3</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Person{
</span><span style="color: #008080;"> 4</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> eat(){
</span><span style="color: #008080;"> 5</span>         <span style="color: #0000ff;">echo</span> "eat.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;"> 6</span> <span style="color: #000000;">    }
</span><span style="color: #008080;"> 7</span> <span style="color: #000000;">}
</span><span style="color: #008080;"> 8</span> 
<span style="color: #008080;"> 9</span> <span style="color: #000000;">trait Drive{
</span><span style="color: #008080;">10</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> call(){
</span><span style="color: #008080;">11</span>         <span style="color: #0000ff;">echo</span> "phone call.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;">12</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">13</span> <span style="color: #000000;">}
</span><span style="color: #008080;">14</span> 
<span style="color: #008080;">15</span> <span style="color: #0000ff;">class</span> Student <span style="color: #0000ff;">extends</span><span style="color: #000000;"> Person{
</span><span style="color: #008080;">16</span>     <span style="color: #0000ff;">use</span><span style="color: #000000;"> Drive;
</span><span style="color: #008080;">17</span>     <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> learning(){
</span><span style="color: #008080;">18</span>         <span style="color: #0000ff;">echo</span> "learn.<br>"<span style="color: #000000;">;
</span><span style="color: #008080;">19</span> <span style="color: #000000;">    }
</span><span style="color: #008080;">20</span> <span style="color: #000000;">}
</span><span style="color: #008080;">21</span> 
<span style="color: #008080;">22</span> <span style="color: #800080;">$student</span> = <span style="color: #0000ff;">new</span><span style="color: #000000;"> Student();
</span><span style="color: #008080;">23</span> <span style="color: #800080;">$student</span>-><span style="color: #000000;">eat();
</span><span style="color: #008080;">24</span> 
<span style="color: #008080;">25</span> <span style="color: #008000;">//</span><span style="color: #008000;">当方法或属性同名时，当前类中的方法会覆盖 trait的 方法，而 trait 的方法又覆盖了基类中的方法</span>
<span style="color: #008080;">26</span> <span style="color: #800080;">$student</span>-><span style="color: #000000;">call();
</span><span style="color: #008080;">27</span> <span style="color: #800080;">$student</span>->learning();

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