Accessing child property from Parent class in php

Question

I come from java background and recently testing some OOP methodology in PHP. I found that it is permitted for a parent class to use Child class property. The code below describes what I am trying to say.

<?php
    class ParentClass {
        public static function test() {
            echo "hello world ". implode(',', static::$prop);
        }
    }

    class ChildClass extends ParentClass {
        public static $prop = ['a' , 'b'];
    }

ChildClass::test();

?>

On the above code, the ParentClass is using the $prop variable from its function test() . This simply outputs with no error. However, it is not permissible in Java. What is the reason behind this methodology in PHP?

Answer 1

Java doesn't have the concept of Late static bindings :

"Late binding" comes from the fact that static:: will not be resolved using the class where the method is defined but it will rather be computed using runtime information.

If you use self:: you'll have the behaviour as you know it from Java. However static:: resolves at runtime.