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How to use instanceof

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Release： 2023-04-02 11:24:02
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这篇文章主要介绍了关于instanceof的使用方法，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

测试单独一个类：

 1 <?php 
 2  
 3 class A 
 4 {
 5     
 6 } 
 7  
 8 $a = new A(); 
 9 if($a instanceof A){
 10     echo "对象\$a实现了A类";
 11 }
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当一个子类继承父类：

 1 <?php 
 2  
 3 class A 
 4 { 
 5      
 6 } 
 7 class B extends A 
 8 { 
 9 
 10 }
 11 $b = new B();
 12 if($b instanceof A){
 13     echo "对象\$b实现了A类";
 14 }
 15 //最终会返回&#39;对象$b实现了A类&#39;;
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当实现接口时：

<?php
interface A
{
//这边你可以定义方法
}class B implements A
{
//实现接口的方法
}$b = new B();if($b instanceof A){    echo "对象\$b实现了A类";
}//最终会返回&#39;对象$b实现了A类&#39;;
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以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP中文网！

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