PHP中静态成员的继承

class Parent {
    public static function method() {
        return "Parent method";
    }
}

class Child extends Parent {
    public static function method() {
        return "Child method";
    }
}

class Parent {
    public static $var = "Parent variable";
}

class Child extends Parent {
    public static function getVar() {
        return self::$var;
    }
}