rewrite_static

<?php

class MyObject {

    public static $myStaticVar = 0;

    function myMethod() {

        self::$myStaticVar += 2;

        echo self::$myStaticVar."\n";

    }

}

class MyOtherObject extends MyObject {

    public static $myStaticVar = 0; //重写了myStaticVar

    function myOtherMethod() {

        echo parent::$myStaticVar."\n";

        echo self::$myStaticVar."\n";

    }

}

$instance1 = new MyObject();

$instance1->myMethod();

$instance2 = new MyObject();

$instance2->myMethod();

$instance3 = new MyOtherObject();

$instance3->myOtherMethod();

//2

//4

//4

//0