搜索
首页后端开发php教程PHP反射API，反射api_PHP教程
PHP反射API，反射api_PHP教程
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
Jul 12, 2016 am 09:06 AM
php

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();

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> }

　　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 />.....

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> }

    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();

　　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> }

写的比较急，难免会有错误，还请大神们多多指正。

转载请注明出处，谢啦！

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1065782.htmlTechArticlePHP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...
声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn
相关文章
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

php把负数转为正整数的方法：1、使用abs()函数将负数转为正数，使用intval()函数对正数取整，转为正整数，语法“intval(abs($number))”；2、利用“~”位运算符将负数取反加一，语法“~$number + 1”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

实现方法：1、使用“sleep(延迟秒数)”语句，可延迟执行函数若干秒；2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句，可延迟执行函数若干秒和纳秒；3、使用“time_sleep_until(time()+7)”语句。

php怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

php除以100保留两位小数的方法：1、利用“/”运算符进行除法运算，语法“数值 / 100”；2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值，并保留两位小数。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

判断方法：1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式；2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的，因此真实天数需要在此基础上加1。

php怎么判断有没有小数点php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PM

php判断有没有小数点的方法：1、使用“strpos(数字字符串,'.')”语法，如果返回小数点在字符串中第一次出现的位置，则有小数点；2、使用“strrpos(数字字符串,'.')”语句，如果返回小数点在字符串中最后一次出现的位置，则有。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

方法：1、用“str_replace("&nbsp;","其他字符",$str)”语句，可将nbsp符替换为其他字符；2、用“preg_replace("/(\s|\&nbsp\;||\xc2\xa0)/","其他字符",$str)”语句。

php怎么设置implode没有分隔符php怎么设置implode没有分隔符Apr 18, 2022 pm 05:39 PM

在PHP中，可以利用implode()函数的第一个参数来设置没有分隔符，该函数的第一个参数用于规定数组元素之间放置的内容，默认是空字符串，也可将第一个参数设置为空，语法为“implode(数组)”或者“implode("",数组)”。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

php字符串有下标。在PHP中，下标不仅可以应用于数组和对象，还可应用于字符串，利用字符串的下标和中括号“[]”可以访问指定索引位置的字符，并对该字符进行读写，语法“字符串名[下标值]”；字符串的下标值（索引值）只能是整数类型，起始值为0。

See all articles

热AI工具

Undresser.AI Undress

Undresser.AI Undress

人工智能驱动的应用程序，用于创建逼真的裸体照片

AI Clothes Remover

AI Clothes Remover

用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool

Undress AI Tool

免费脱衣服图片

Clothoff.io

Clothoff.io

AI脱衣机

AI Hentai Generator

AI Hentai Generator

免费生成ai无尽的。

显示更多

热门文章

R.E.P.O.能量晶体解释及其做什么（黄色晶体）
2 周前By尊渡假赌尊渡假赌尊渡假赌
仓库：如何复兴队友
4 周前By尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island冒险：如何获得巨型种子
3 周前By尊渡假赌尊渡假赌尊渡假赌
击败分裂小说需要多长时间？
3 周前ByDDD
R.E.P.O.保存文件位置：在哪里以及如何保护它？
3 周前ByDDD
显示更多

热工具

禅工作室 13.0.1

禅工作室 13.0.1

功能强大的PHP集成开发环境

SublimeText3汉化版

SublimeText3汉化版

中文版，非常好用

SublimeText3 Linux新版

SublimeText3 Linux新版

SublimeText3 Linux最新版

记事本++7.3.1

记事本++7.3.1

好用且免费的代码编辑器

Dreamweaver CS6

Dreamweaver CS6

视觉化网页开发工具

显示更多

热门话题

gmail邮箱登陆入口在哪里
7316
9
Java教程
1625
14
CakePHP 教程
1349
46
Laravel 教程
1261
25
PHP教程
1208
29
显示更多