Description:
------------
If you extend a class, which has a static property, and set that static property, 
it will overwrite the variable in the parent, not in the child. 

Test script:
---------------
<?php

class One {
	
	public static $var = 'hi';
}

class Two extends One {
	
	public static function set($var) {
		static::$var = $var;
	}
}

Two::set('bye');

var_dump(One::$var);

Expected result:
----------------
"hi"

Actual result:
--------------
"bye"