php构造函数的继承方法，php构造函数继承
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：
<?php
class A{
public $name;
function __construct(){
echo $this->name="小强";
}
}
class B extends A{
}
$bb = new B();
?>
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：
<?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();
?>
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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