PHP反射API，反射api-php手册-PHP中文網

PHP反射API，反射api

　　近期忙着写项目，没有学习什么特别新的东西，所以好长时间没有更新博客。我们的项目用的是lumen，是基于laravel的一个轻量级框架，我看到里面用到了一些反射API机制来帮助动态加载需要的类、判断方法等，所以本篇文章就把在PHP中经常用到的反射API给大家分享一下吧，想学习反射API的同学可以看看。

　　说起反射ApI，自我感觉PHP中的反射ApI和java中的java.lang.reflect包差不多，都是由可以打印和分析类成员属性、方法的一组内置类组成的。可能你已经学习过对象函数比如：get_class_vars()但是使用反射API会更加的灵活、输出信息会更加详细。

　　首先我们需要知道，反射API不仅仅是用来检查类的，它本身包括一组类，用来完成各种功能：常用的类如下：

Reflection类	可以打印类的基本信息，（通过提供的静态export()函数）
ReflectionMethod类	见名知意，打印类方法、得到方法的具体信息等
ReflectionClass类	用于得到类信息，比如得到类包含的方法，类本的属性，是不是抽象类等
ReflectionParameter类	显示参数的信息，可以动态得到已知方法的传参情况
ReflectionException类	用于显示错误信息
ReflectionExtension类	得到PHP的扩展信息，可以判断扩展是否存在等

传统的打印类信息与反射APi的区别
下面是一段我自己写的参数程序，用于演示反射的使用：

<span> 1</span> <?<span>php
</span><span> 2</span> 
<span> 3</span> <span>class</span><span> Person
</span><span> 4</span> <span>{
</span><span> 5</span>     <span>//</span><span>成员属性</span>
<span> 6</span>     <span>public</span> <span>$name</span><span>;
</span><span> 7</span>     <span>public</span> <span>$age</span><span>; 
</span><span> 8</span> 
<span> 9</span>     <span>//</span><span>构造方法</span>
<span>10</span>     <span>public</span> <span>function</span> __construct(<span>$name</span>, <span>$age</span><span>)
</span><span>11</span> <span>    {
</span><span>12</span>         <span>$this</span>->name = <span>$name</span><span>;
</span><span>13</span>         <span>$this</span>->age = <span>$age</span><span>;
</span><span>14</span> <span>    }
</span><span>15</span> 
<span>16</span>     <span>//</span><span>成员方法</span>
<span>17</span>     <span>public</span> <span>function</span> set_name(<span>$name</span><span>)
</span><span>18</span> <span>    {
</span><span>19</span>         <span>$this</span>-><span>$name</span> = <span>$name</span><span>;
</span><span>20</span> <span>    }
</span><span>21</span> 
<span>22</span>     <span>public</span> <span>function</span><span> get_name()
</span><span>23</span> <span>    {
</span><span>24</span>         <span>return</span> <span>$this</span>-><span>$name</span><span>;
</span><span>25</span> <span>    }
</span><span>26</span> 
<span>27</span>     <span>public</span> <span>function</span><span> get_age()
</span><span>28</span> <span>    {
</span><span>29</span>         <span>return</span> <span>$this</span>-><span>$age</span><span>;
</span><span>30</span> <span>    }
</span><span>31</span> 
<span>32</span>     <span>public</span> <span>function</span><span> get_user_info()
</span><span>33</span> <span>    {
</span><span>34</span>         <span>$info</span> = '姓名：' . <span>$this</span>-><span>name;
</span><span>35</span>         <span>$info</span> .= ' 年龄：' . <span>$this</span>-><span>age;
</span><span>36</span>         <span>return</span> <span>$info</span><span>;
</span><span>37</span> <span>    }
</span><span>38</span> <span>}
</span><span>39</span> 
<span>40</span> <span>class</span> Teacher <span>extends</span><span> Person
</span><span>41</span> <span>{
</span><span>42</span>     <span>private</span> <span>$salary</span> = 0<span>;
</span><span>43</span> 
<span>44</span>     <span>public</span> <span>function</span> __construct(<span>$name</span>, <span>$age</span>, <span>$salary</span><span>)
</span><span>45</span> <span>    {
</span><span>46</span>         parent::__construct(<span>$name</span>, <span>$age</span><span>);
</span><span>47</span>         <span>$this</span>->salary = <span>$salary</span><span>;
</span><span>48</span> <span>    }
</span><span>49</span> 
<span>50</span>     <span>public</span> <span>function</span><span> get_salary()
</span><span>51</span> <span>    {
</span><span>52</span>         <span>return</span> <span>$this</span>-><span>$salary</span><span>;
</span><span>53</span> <span>    }
</span><span>54</span> 
<span>55</span>     <span>public</span> <span>function</span><span> get_user_info()
</span><span>56</span> <span>    {
</span><span>57</span>         <span>$info</span> = parent::<span>get_user_info();
</span><span>58</span>         <span>$info</span> .= " 工资：" . <span>$this</span>-><span>salary;
</span><span>59</span>         <span>return</span> <span>$info</span><span>;
</span><span>60</span> <span>    }
</span><span>61</span> <span>}
</span><span>62</span> 
<span>63</span> <span>class</span> Student <span>extends</span><span> Person
</span><span>64</span> <span>{
</span><span>65</span>     <span>private</span> <span>$score</span> = 0<span>;
</span><span>66</span> 
<span>67</span>     <span>public</span> <span>function</span> __construct(<span>$name</span>, <span>$age</span>, <span>$score</span><span>)
</span><span>68</span> <span>    {
</span><span>69</span>         parent::__construct(<span>$name</span>, <span>$age</span><span>);
</span><span>70</span>         <span>$this</span>->score = <span>$score</span><span>;
</span><span>71</span> <span>    }
</span><span>72</span> 
<span>73</span>     <span>public</span> <span>function</span><span> get_score()
</span><span>74</span> <span>    {
</span><span>75</span>         <span>return</span> <span>$this</span>-><span>score;        
</span><span>76</span> <span>    }
</span><span>77</span> 
<span>78</span>     <span>public</span> <span>function</span><span> get_user_info()
</span><span>79</span> <span>    {
</span><span>80</span>         <span>$info</span> = parent::<span>get_user_info();
</span><span>81</span>         <span>$info</span> .= " 成绩：" . <span>$this</span>-><span>score;
</span><span>82</span>         <span>return</span> <span>$info</span><span>;
</span><span>83</span> <span>    }
</span><span>84</span> <span>}
</span><span>85</span> 
<span>86</span> <span>header</span>("Content-type:text/html;charset=utf8;"<span>);
</span><span>87</span> <span>$te_obj</span> = <span>new</span> Teacher('李老师', '36', '2000'<span>);
</span><span>88</span> <span>$te_info</span> = <span>$te_obj</span>-><span>get_user_info();
</span><span>89</span> 
<span>90</span> <span>$st_obj</span> = <span>new</span> Student('小明', '13', '80'<span>);
</span><span>91</span> <span>$st_info</span> = <span>$st_obj</span>->get_user_info();

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我们先用var_dump();打印类的信息，如下所示，可以看出只是打印出类的简单信息，甚至连方法也没有，所以从这样的信息中看不出其他游泳的信息。

var_dump($te_obj);

<span>1</span> <span>object</span>(Teacher)<span>#</span><span>1 (3) {</span>
<span>2</span>       ["salary":"Teacher":<span>private</span>]=>
<span>3</span>           <span>string</span>(4) "2000"
<span>4</span>       ["name"]=>
<span>5</span>           <span>string</span>(9) "李老师"
<span>6</span>       ["age"]=>
<span>7</span>           <span>string</span>(2) "36"
<span>8</span> }

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　　Reflection::export($obj);

　　我们利用Reflection提供的内置方法export来打印信息，如下所示：

　　打印出的信息比较完整，包括成员属性，成员方法，类的基本信息，文件路径，方法信息，方法属性，传参情况，所在文件的行数等等。比较全面的展示了类的信息。可以看出var_dump()或者print_r只能显示类的简要信息，好多信息根本显示不出来，所以他们只能做简单的调试之用，反射Api则提供的类更多的信息，可以很好地帮助我们知道调用类的情况，这对写接口，特别是调用别人的接口提供了极大的便利。如果出了问题，也可以帮助调试。

<span> 1</span> <span>object</span>(Teacher)<span>#</span><span>1 (3) {</span>
<span> 2</span>       ["salary":"Teacher":<span>private</span>]=>
<span> 3</span>           <span>string</span>(4) "2000"
<span> 4</span>       ["name"]=>
<span> 5</span>           <span>string</span>(9) "李老师"
<span> 6</span>       ["age"]=>
<span> 7</span>           <span>string</span>(2) "36"
<span> 8</span> <span>}
</span><span> 9</span> <span>Class</span> [  <span>class</span><span> Person ] {
</span><span>10</span>       @@ /usr/local/www/phptest/oop/reflaction.php 3-38
<span>11</span>       - Constants [0<span>] {
</span><span>12</span> <span>      }
</span><span>13</span>       - <span>Static</span> properties [0<span>] {
</span><span>14</span> <span>      }
</span><span>15</span>       - <span>Static</span> methods [0<span>] {
</span><span>16</span> <span> }
</span><span>17</span>   - Properties [2<span>] {
</span><span>18</span>         Property [  <span>public</span> <span>$name</span><span> ]
</span><span>19</span>         Property [  <span>public</span> <span>$age</span><span> ]
</span><span>20</span> <span>  }
</span><span>21</span> 
<span>22</span>   - Methods [5<span>] {
</span><span>23</span>     Method [  <span>public</span><span> method __construct ] {
</span><span>24</span>       @@ /usr/local/www/phptest/oop/reflaction.php 10 - 14
<span>25</span> 
<span>26</span>       - Parameters [2<span>] {
</span><span>27</span>         Parameter <span>#</span><span>0 [  $name ]</span>
<br />.....

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反射API的具体使用:

　　看过框架源码的同学都知道框架都可以加载第三方的插件、类库等等。下面这个例子咱们借助反射APi简单实现这个功能，该例子原型是我从书上学习的，我理解后按照自己的思路写了一套：要实现的功能：用一个类去动态的遍历调用Property类对象，类可以自由的加载其他的类的方法，而不用吧类嵌入到已有的代码，也不用手动去调用类库的代码。
约定：每一个类要包含work方法，可以抽象出一个接口。可以把每个类的信息放在文件中，相当于各个类库信息，通过类保存的Property类库的对应对象，然后调用每个类库的work方法。

下面是基础代码：

<span> 1</span> <span>/*</span><span>属性接口</span><span>*/</span>
<span> 2</span> <span>interface</span><span> Property
</span><span> 3</span> <span>{
</span><span> 4</span>     <span>function</span><span> work();
</span><span> 5</span> <span>}
</span><span> 6</span> 
<span> 7</span> <span>class</span><span> Person
</span><span> 8</span> <span>{
</span><span> 9</span>     <span>public</span> <span>$name</span><span>;
</span><span>10</span>     <span>public</span> <span>function</span> __construct(<span>$name</span><span>)
</span><span>11</span> <span>    {
</span><span>12</span>         <span>$this</span>->name = <span>$name</span><span>;
</span><span>13</span> <span>    }
</span><span>14</span> <span>}
</span><span>15</span> 
<span>16</span> <span>class</span> StudentController <span>implements</span><span> Property
</span><span>17</span> <span>{
</span><span>18</span>     <span>//</span><span>set方法，但需要Person对象参数</span>
<span>19</span>     <span>public</span> <span>function</span> setPerson(Person <span>$obj_person</span><span>)
</span><span>20</span> <span>    {
</span><span>21</span>         <span>echo</span> 'Student ' . <span>$obj_person</span>-><span>name;
</span><span>22</span> <span>    }
</span><span>23</span> 
<span>24</span>     <span>//</span><span>work方法简单实现</span>
<span>25</span>     <span>public</span> <span>function</span><span> work()
</span><span>26</span> <span>    {
</span><span>27</span>         <span>echo</span> 'student working!'<span>;
</span><span>28</span> <span>    }
</span><span>29</span> <span>}
</span><span>30</span> 
<span>31</span> <span>class</span> EngineController <span>implements</span><span> Property
</span><span>32</span> <span>{
</span><span>33</span>     <span>//</span><span>set方法</span>
<span>34</span>     <span>public</span> <span>function</span> setWeight(<span>$weight</span><span>)
</span><span>35</span> <span>    {
</span><span>36</span>         <span>echo</span> 'this is engine -> set weight'<span>;
</span><span>37</span> <span>    }
</span><span>38</span> 
<span>39</span>     <span>public</span> <span>function</span> setPrice(<span>$price</span><span>)
</span><span>40</span> <span>    {
</span><span>41</span>         <span>echo</span> "this is engine -> set price"<span>;
</span><span>42</span> <span>    }
</span><span>43</span> 
<span>44</span>     <span>//</span><span>work方法简单实现</span>
<span>45</span>     <span>public</span> <span>function</span><span> work()
</span><span>46</span> <span>    {
</span><span>47</span>         <span>echo</span> 'engine working!'<span>;
</span><span>48</span> <span>    }
</span><span>49</span> }

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这里定义了两个相似类实现Property接口，同时都简单实现work()方法 StudentController类稍微不同，参数需要Person对象，同时我们可以使用文件来保存各个类的信息，我们也可以用成员属性代替。

<span> 1</span> <span>class</span><span> Run
</span><span> 2</span> <span>{
</span><span> 3</span>     <span>public</span> <span>static</span> <span>$mod_arr</span> =<span> [];
</span><span> 4</span>     <span>public</span> <span>static</span> <span>$config</span> =<span> [
</span><span> 5</span>         'StudentController' =><span> [
</span><span> 6</span>             'person' => 'xiao ming'
<span> 7</span>         ],
<span> 8</span>         'EngineController'  =><span> [
</span><span> 9</span>             'weight' => '500kg',
<span>10</span>             'price'  => '4000'
<span>11</span> <span>        ]
</span><span>12</span> <span>    ];
</span><span>13</span> 
<span>14</span>     <span>//</span><span>加载初始化</span>
<span>15</span>     <span>public</span> <span>function</span><span> __construct()
</span><span>16</span> <span>    {
</span><span>17</span>         <span>$config</span> = self::<span>$config</span><span>;
</span><span>18</span>         <span>//</span><span>用于检查是不是实现类</span>
<span>19</span>         <span>$property</span> = <span>new</span> ReflectionClass('Property'<span>);
</span><span>20</span>         
<span>21</span>         <span>//
</span><span>22</span>         <span>foreach</span> (<span>$config</span> <span>as</span> <span>$class_name</span> => <span>$params</span><span>) 
</span><span>23</span> <span>        {
</span><span>24</span>             <span>$class_reflect</span> = <span>new</span> ReflectionClass(<span>$class_name</span><span>);
</span><span>25</span>             <span>if</span>(!<span>$class_reflect</span>->isSubclassOf(<span>$property</span><span>)) <span>//用isSubclassOf方法检查是否是这个对象
</span></span><span>26</span> <span>            {
</span><span>27</span>                 <span>echo</span> 'this is  error'<span>;
</span><span>28</span>                 <span>continue</span><span>;
</span><span>29</span> <span>            }
</span><span>30</span> 
<span>31</span>             <span>//</span><span>得到类的信息</span>
<span>32</span>             <span>$class_obj</span> = <span>$class_reflect</span>-><span>newInstance();
</span><span>33</span>             <span>$class_method</span> = <span>$class_reflect</span>-><span>getMethods();
</span><span>34</span> 
<span>35</span>             <span>foreach</span> (<span>$class_method</span> <span>as</span> <span>$method_name</span><span>) 
</span><span>36</span> <span>            {
</span><span>37</span>                 
<span>38</span>                 <span>$this</span>->handle_method(<span>$class_obj</span>, <span>$method_name</span>, <span>$params</span><span>);
</span><span>39</span> <span>            }
</span><span>40</span>             <span>array_push</span>(self::<span>$mod_arr</span>, <span>$class_obj</span><span>);
</span><span>41</span> <span>        }
</span><span>42</span> <span>    }
</span><span>43</span> 
<span>44</span>     <span>//</span><span>处理方法调用</span>
<span>45</span>     <span>public</span> <span>function</span> handle_method(Property <span>$class_obj</span>, ReflectionMethod <span>$method_name</span>, <span>$params</span><span>)
</span><span>46</span> <span>    {
</span><span>47</span>         <span>$m_name</span> = <span>$method_name</span>-><span>getName();
</span><span>48</span>         
<span>49</span>         <span>$args</span> = <span>$method_name</span>-><span>getParameters();
</span><span>50</span>         <span>if</span>(<span>count</span>(<span>$args</span>) != 1 || <span>substr</span>(<span>$m_name</span>, 0, 3) != 'set'<span>)
</span><span>51</span> <span>        {    
</span><span>52</span>             <span>return</span> <span>false</span><span>;
</span><span>53</span> <span>        }
</span><span>54</span>         <span>//大小写转换，做容错处理</span>
<span>55</span>         <span>$property</span> = <span>strtolower</span>(<span>substr</span>(<span>$m_name</span>, 3<span>));
</span><span>56</span> 　　　　　
<span>57</span>         <span>if</span>(!<span>isset</span>(<span>$params</span>[<span>$property</span><span>]))
</span><span>58</span> <span>        {
</span><span>59</span>             <span>return</span> <span>false</span><span>;
</span><span>60</span> <span>        }
</span><span>61</span> 
<span>62</span>         <span>$args_class</span> = <span>$args</span>[0]-><span>getClass();
</span><span>63</span>         <span>echo</span> '<pre class="brush:php;toolbar:false">'<span>;
</span><span>64</span>         <span>if</span>(<span>empty</span>(<span>$args_class</span><span>))
</span><span>65</span> <span>        {
</span><span>66</span>             <span>$method_name</span>->invoke(<span>$class_obj</span>, <span>$params</span>[<span>$property</span><span>]); <span>//如果得到的类为空证明需要传递基础类型参数
</span></span><span>67</span>         } <span>else</span><span> {
</span><span>68</span>             <span>$method_name</span>->invoke(<span>$class_obj</span>, <span>$args_class</span>->newInstance(<span>$params</span>[<span>$property</span><span>])); <span>//如果不为空说明需要传递真实对象
</span></span><span>69</span> <span>        }
</span><span>70</span> <span>    }
</span><span>71</span> <span>}
</span><span>72</span> 
<span>73</span> <span>//程序开始
</span><span>74</span> <span>new</span> Run();

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　　到此程序结束，Run启动会自动调用构造方法，初始化要加载类库的其他成员属性，包括初始化和执行相应方法操作，这里只是完成了对应的set方法。其中$mod_arr属性保存了所有调用类的对象，每个对象包含数据，可以遍历包含的对象来以此调用work()方法。

　　程序只做辅助理解反射PAI用，各个功能没有完善，里面用到了好多反射API的类，方法，下面会有各个方法的总结。

反射API提供的常用类和函数：

下面提供的函数是常用的函数，不是全部，有的函数根本用不到，所以我们有往撒谎那个写，想看全部的可以到网上搜一下，比较多。提供的这组方法没有必要背下来，用到的时候可以查看。

<span> 1</span> 1<span>：Reflection
</span><span> 2</span> 　　<span>public</span> <span>static</span> export(Reflector r [,bool <span>return</span>])<span>//</span><span>打印类或方法的详细信息</span>
<span> 3</span> 　　<span>public</span> <span>static</span>  getModifierNames(int modifiers)  <span>//</span><span>取得修饰符的名字</span>
<span> 4</span> 
<span> 5</span> 2<span>：ReflectionMethod：
</span><span> 6</span>     <span>public</span> <span>static</span> <span>string</span> export()                       <span>//</span><span>打印该方法的信息</span>
<span> 7</span>     <span>public</span> <span>mixed</span> invoke(stdclass <span>object</span>, <span>mixed</span>* args)   <span>//</span><span>调用对应的方法</span>
<span> 8</span>     <span>public</span> <span>mixed</span> invokeArgs(stdclass <span>object</span>, <span>array</span> args)<span>//</span><span>调用对应的方法，传多参数</span>
<span> 9</span>     <span>public</span> bool isFinal()        <span>//</span><span>方法是否为final</span>
<span>10</span>     <span>public</span> bool isAbstract()     <span>//</span><span>方法是否为abstract</span>
<span>11</span>     <span>public</span> bool isPublic()       <span>//</span><span>方法是否为public</span>
<span>12</span>     <span>public</span> bool isPrivate()      <span>//</span><span>方法是否为private</span>
<span>13</span>     <span>public</span> bool isProtected()    <span>//</span><span>方法是否为protected</span>
<span>14</span>     <span>public</span> bool isStatic()       <span>//</span><span>方法是否为static</span>
<span>15</span>     <span>public</span> bool isConstructor()  <span>//</span><span>方法是否为构造函数</span>
<span>16</span> 
<span>17</span> 
<span>18</span> 3<span>：ReflectionClass：
</span><span>19</span>     <span>public</span> <span>static</span> <span>string</span> export()  <span>//</span><span>打印类的详细信息</span>
<span>20</span>     <span>public</span> <span>string</span> getName()        <span>//</span><span>取得类名或接口名</span>
<span>21</span>     <span>public</span> bool isInternal()       <span>//</span><span>类是否为系统内部类</span>
<span>22</span>     <span>public</span> bool isUserDefined()    <span>//</span><span>类是否为用户自定义类</span>
<span>23</span>     <span>public</span> bool isInstantiable()   <span>//</span><span>类是否被实例化过</span>
<span>24</span>     <span>public</span> bool hasMethod(<span>string</span> name)  <span>//</span><span>类是否有特定的方法</span>
<span>25</span>     <span>public</span> bool hasProperty(<span>string</span> name)<span>//</span><span>类是否有特定的属性</span>
<span>26</span>     <span>public</span> <span>string</span> getFileName()         <span>//</span><span>获取定义该类的文件名，包括路径名</span>
<span>27</span>     <span>public</span> int getStartLine()           <span>//</span><span>获取定义该类的开始行</span>
<span>28</span>     <span>public</span> int getEndLine()             <span>//</span><span>获取定义该类的结束行</span>
<span>29</span>     <span>public</span> <span>string</span> getDocComment()       <span>//</span><span>获取该类的注释</span>
<span>30</span>     <span>public</span> ReflectionMethod getConstructor()           <span>//</span><span>取得该类的构造函数信息</span>
<span>31</span>     <span>public</span> ReflectionMethod getMethod(<span>string</span> name)    <span> //</span><span>取得该类的某个特定的方法信息</span>
<span>32</span>     <span>public</span> ReflectionMethod[] getMethods()             <span>//</span><span>取得该类的所有的方法信息</span>
<span>33</span>     <span>public</span> ReflectionProperty getProperty(<span>string</span> name) <span>//</span><span>取得某个特定的属性信息</span>
<span>34</span>     <span>public</span> ReflectionProperty[] getProperties()        <span>//</span><span>取得该类的所有属性信息</span>
<span>35</span>     <span>public</span> <span>array</span> getConstants()                         <span>//</span><span>取得该类所有常量信息</span>
<span>36</span>     <span>public</span> <span>mixed</span> getConstant(<span>string</span> name)               <span>//</span><span>取得该类特定常量信息</span>
<span>37</span>     <span>public</span> ReflectionClass[] getInterfaces()            <span>//</span><span>取得接口类信息</span>
<span>38</span>     <span>public</span> bool isInterface()  <span>//</span><span>测试该类是否为接口</span>
<span>39</span>     <span>public</span> bool isAbstract()   <span>//</span><span>测试该类是否为抽象类</span>
<span>40</span> 
<span>41</span> 4<span>：ReflectionParameter：
</span><span>42</span>     <span>public</span> <span>static</span> <span>string</span> export()     <span>//</span><span>导出该参数的详细信息</span>
<span>43</span>     <span>public</span> <span>string</span> getName()           <span>//</span><span>取得参数名</span>
<span>44</span>     <span>public</span> bool isPassedByReference() <span>//</span><span>测试该参数是否通过引用传递参数</span>
<span>45</span>     <span>public</span> ReflectionClass getClass() <span>//</span><span>若该参数为对象，返回该对象的类名</span>
<span>46</span>     <span>public</span> bool isArray()             <span>//</span><span>测试该参数是否为数组类型</span>
<span>47</span>     <span>public</span> bool allowsNull()          <span>//</span><span>测试该参数是否允许为空</span>
<span>48</span>     <span>public</span> bool isOptional()          <span>//</span><span>测试该参数是否为可选的，当有默认参数时可选</span>
<span>49</span>     <span>public</span> bool isDefaultValueAvailable() <span>//</span><span>测试该参数是否为默认参数</span>
<span>50</span>     <span>public</span> <span>mixed</span> getDefaultValue()        <span>//</span><span>取得该参数的默认值</span>
<span>51</span> 
<span>52</span> 5<span>：ReflectionExtension类
</span><span>53</span> 
<span>54</span>     <span>public</span> <span>static</span>  export()    <span>//</span><span>导出该扩展的所有信息</span>
<span>55</span>     <span>public</span> <span>string</span> getName()    <span>//</span><span>取得该扩展的名字</span>
<span>56</span>     <span>public</span> <span>string</span> getVersion() <span>//</span><span>取得该扩展的版本</span>
<span>57</span>     <span>public</span> ReflectionFunction[] getFunctions()   <span>//</span><span>取得该扩展的所有函数</span>
<span>58</span>     <span>public</span> <span>array</span> getConstants()  <span>//</span><span>取得该扩展的所有常量</span>
<span>59</span>     <span>public</span> <span>array</span> getINIEntries() <span>//</span><span>取得与该扩展相关的，在php.ini中的指令信息</span>
<span>60</span> }

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写的比较急，难免会有错误，还请大神们多多指正。

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