Description:
------------
When call_user_func is given callback array with class name as string, it refuses to call non-static functions, even though PHP can call it with just E_STRICT.

Reproduce code:
---------------
<?php
class Foo {
        function bar() { echo "OK!"; }
}
call_user_func(array("Foo", "bar"), 123);
Foo::bar(123);


Expected result:
----------------
OK!OK!

Actual result:
--------------
Warning: call_user_func() expects parameter 1 to be valid callback, array given in t.php on line 5
OK!