What is the method of calling the parent class constructor in php?

php calls the parent class constructor: first, the parent class constructs the function first, the code is [public function __construct()]; then use [parent::__construct()] to call the parent class constructor.

php calls the parent class constructor method:

1. Use the function [parent::__construct()] to call The parent class constructor

code is as follows;

<?php
class MyClass    //父类
{
    public function __construct()    //父类构造函数
{
    echo "父类的构造函数";
}
}
class ChildClass extends MyClass     //子类 
{
    public function __construct()    //子类构造函数
{
        echo "子类的构造函数"."<br>";
        parent::__construct();    //调用父类构造函数
    }
}
$childClass = new ChildClass();    //对类的实例化
?>

2. Running results

Constructor of the subclass

Constructor of the parent class

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