How to retrieve a static property of the subclass in a static method in the super class

Question

I have a situation similar to the following code:

class ParentClass
{

    public static $property = 'parentValue';

    public static function doSomethingWithProperty() {

        echo 'Method From Parent Class:' . self::$property . "\n";

    }

}

class ChildClass extends ParentClass 
{

    public static $property = 'childValue';

}


echo "Directly: " . ChildClass::$property . "\n";
ChildClass::doSomethingWithProperty();

Running this from the cli I get the output:

Directly: childValue
Method From Parent Class: parentValue

Is there a way to retrieve the static property defined in a subclass from a static method defined in the parent class?

Answer 1

Using self keyword always reference same class.

To allow overriding of static property/method you have to use static keyword. Your method should look like this

public static function doSomethingWithProperty()
{
    echo 'Method From Parent Class:' . static::$property . "\n";
}