Description:
------------
This is more a doubt that a bug, when I don't pass any param to the function get_class() or pass a variable that it value is NULL the function return the current Class where the script run's, is this behavior correct ?

I ask because some time when I try to debug something and use the function get_class() I will pass some var and sometimes this var is NULL, turning my debug a bit confuse because any other scalar value that I pass this will throw an exception saying that the param is not an object.

Sorry for any noob question and thanks for any feedback.

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

class Foo
{
    public function bar()
    {
        echo get_class();
    }
}

$foo = new Foo;
$foo->bar();// Foo


Expected result:
----------------
Throw exception saying that the param is not a object instance.

Actual result:
--------------
Return the name of the current class