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PHP delayed static binding example analysis

高洛峰
高洛峰Original
2016-12-26 16:10:511101browse

The example in this article describes the method of delayed static binding in PHP. Share it with everyone for your reference. The specific analysis is as follows:

php delayed static binding: refers to the self of the class, which is not based on the time of definition, but based on the running results during calculation. Let’s look at an example first

<?php
header("content-type:text/html;charset=utf-8");
class Human{
 public static function hei(){
 echo "我是父类的hei()方法";
 }
 public function say(){//如果子类调用父类的say()方法,则
 self::hei();//这里调用的是父类的hei()方法
 static::hei();
//这里调用子类的hei()方法,如果子类不存在hei()方法,则调用父类的
 }
}
class Stu extends Human{
 public static function hei(){
 echo "我是子类的hei()方法";
 }
}
 
$stu = new Stu();
$stu->say();
?>

Description:

(1) When the subclass instantiated object $stu calls the say method, it runs in the parent class Human, so , self::hei() in say() calls the hei() method of the parent class.

(2) static::method name(): If you use the static keyword, you will first search for the method in the subclass; if it cannot be found, search it in the parent class.

I hope this article will be helpful to everyone’s PHP programming design.

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