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php构造函数的继承方法,php构造函数继承

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Release: 2016-06-13 09:15:14
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php构造函数的继承方法,php构造函数继承

本文实例讲述了php构造函数的继承方法。分享给大家供大家参考。具体如下:

第一种情况:子类没有定义构造函数时,默认继承。例子:

<&#63;php
class A{
 public $name;
 function __construct(){
 echo $this->name="小强";
 }
}
class B extends A{
 
}
$bb = new B();
&#63;>
Copy after login

输出结果:小强

第二种情况:子类定义了构造函数,则不会被继承。实例:

<&#63;php
class A{
 public $name;
 function __construct(){
 echo $this->name="小强";
 }
}
class B extends A{
 function __construct(){
 echo "BBBBBB子类";
 }
}
$bb = new B();
&#63;>
Copy after login

输出结果:BBBBBB子类

第三种情况:如果需要调用父类的构造函数,则可以使用:parent::父类函数 或 父类名::父类函数。

希望本文所述对大家的php程序设计有所帮助。

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