php构造函数的继承方法，php构造函数继承-php手册-php.cn

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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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Jun 13, 2016 am 09:15 AM

phpConstructorinherit

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;>

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;>

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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