Description:
------------
The Calculation of sizeof + func_num_args within a for does not work / 
ends in an endless-for.

Reproduce code:
---------------
f("this","is","a","test");

function f()
{
   $wuergs = array (
        0 => "1234",
        1 => "B",
        2 => "C",
        3 => "D"
    );

	$args=func_get_args();
	for($i=4;$i<((func_num_args() + sizeof($wuergs)));$i++)
	{
        	$wuergs[$i]=$args[$i-4];
    	}
	return l_backend($wuergs);
}

Expected result:
----------------
Moving the content of $args four arrays highr.

Actual result:
--------------
Endless loop.