php 类(class)的趣味理解

<?php    

//枪的类
class gun{
    // 弹匣不同的枪有不同弹匣和装弹数量
    protected $magazine ='';

    //初始化弹夹,也就是给抢上弹夹
    public function  __construct(int $magazine=0)
    {
        $this->magazine = $magazine;
    }

    //开火,单发点射.消耗弹夹子弹量.
    public function fire(){
        $this->magazine--;
    }

    public function getMagazine(){
        return $this->magazine;
    }
}

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//游戏开始 先买一把AWP
//echo 'I am AWP';  //有趣带 , 的 echo 前面不能有 echo 否则不显示
$AWP = new gun(10);
echo "Use AWP\n",$AWP->getMagazine(),"\n";
$AWP->fire();
echo $AWP->getMagazine(),"\n";


//再买一把AK
$AK47 = new gun(30);
echo "Use AK\n",$AK47->getMagazine(),"\n";
$AK47->fire();
$AK47->fire();
$AK47->fire();
echo $AK47->getMagazine(),"\n";