PHP object-oriented inheritance constructor

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Inheritance of constructor methods

Constructor methods can be inherited, and the principles of inheritance are the same as ordinary methods. Furthermore, if the subclass also When a constructor is declared, the constructor of the parent class will be overwritten. If the constructor of the parent class is overwritten, naturally, only the new constructor in the subclass will be executed.

// === Code part 1 ===

class Human {
    public function __construct() {
        echo &#39;呱呱坠地！<br >&#39;;
    }
}class Stu extends Human {}$ming = new Stu(); // 呱呱坠地！// 这说明构造函数也是可以继承的

// ===Code part 2===

class Emperor extends Human {
    public function __construct() {
        echo &#39;红光满屋，终日不散<br >&#39;;
    }
}$zhu = new Emperor();echo &#39;<hr >&#39;;

// ===Notes part===

/*
If there is a constructor when inheriting from a subclass,
add a sentence to the constructor:
parent::__construct();

Then write your own business Logic.
*/

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