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