Description:
------------
PHP 5.4.7

When "self" is provided to is_callable, while inside a class that doesn't contain the method nor has a parent with the method, it will behave as $this.

Subsequent calling of the method which had been falsely declared callable, will result in 

Fatal error: Call to undefined method A::y() in *__FILE__* on line 5

Test script:
---------------
<?php
	class A {
		public function x() {
			if (is_callable(array($this, "y"))) $this::y();
			if (is_callable(array("self", "y"))) self::y();
		}
	}
	
	class B extends A {
		public function y() {}
	}
	
	(new B())->x();
?>

Expected result:
----------------
Self should behalve like __CLASS__ in the example above and the fatal error should be avoided.