php组合，php排列组合算法_PHP教程

php组合，php排列组合算法

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

模式二：

1 php 2 //组合模式二 3 class Person{ 4 public function eat(){ 5 echo "eat.
"; 6 } 7 } 8 9 trait Drive{ 10 public function call(){ 11 echo "phone call.
"; 12 } 13 } 14 15 class Student extends Person{ 16 use Drive; 17 public function learning(){ 18 echo "learn.
"; 19 } 20 } 21 22 $student = new Student(); 23 $student->eat(); 24 25 //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 26 $student->call(); 27 $student->learning(); View Code

 

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