在没有实例化的情况下从超类访问子变量

Question

I'm attempting to access member variables in a child class via the parent class without instantiation.

This is one of my attempts but B::getStatic() fails with Access to undeclared static property.

Is there another solution to this, possibly without static?

class A {

    static public function getStatic() {

        return self::$myStatic;

    }

}

class B extends A {

    public static $myStatic = 5;

}

class C extends A {

    public static $myStatic = 6;

}

var_dump(B::$myStatic);
var_dump(B::getStatic());

var_dump(C::$myStatic);
var_dump(C::getStatic());

Answer 1

The concept you're running into is called "Late Static Binding." Until PHP 5.3.0, there was no support for this.

If you're running 5.3.0 or higher, update the getStatic() method:

static public function getStatic() {

return static::$myStatic;

}