当我运行这段代码时，我得到了我不明白的东西 [英] When I run this code I get what I don't understand

问题描述

<?php
class Cars {
	static $wheel_count = 4;
	static $door_count = 2;

	static function car_detail(){
		return self::$wheel_count;
		return self::$door_count;
	}
}
class Trucks extends Cars {

	static function display(){

		echo parent::car_detail();
	}
}

Trucks::display();

 ?>

我尝试了什么：



您好，我有一个问题，我是PHP的新手，当我运行此代码时，我有结果4.为什么我没有4和2，我运行功能显示得到wheel_count和door_count，为什么我只有wheel_count 4？

What I have tried:

Hello, i have a question please, i'm a newbie on PHP and when i run this code i have as result 4.Why i don't have 4 and 2, i ran the function display to get wheel_count and door_count, so why i have just wheel_count 4 ?

推荐答案

wheel_count = 4 ;
static

wheel_count = 4; static

door_count = 2 ;

静态函数car_detail（）{
return self ::

door_count = 2; static function car_detail(){ return self::

wheel_count;
return self ::

wheel_count; return self::

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