Description:
------------
If you call and enumerate the information from a debug_backtrace() in a user error handler then the argument list is out of step with the other information.

Reproduce code:
---------------
function userErrorHandler($num, $msg, $file, $line, $vars)
{
    debug_print_backtrace();
}

$OldErrorHandler = set_error_handler("userErrorHandler");


function GenerateError1($A1)
{
    $a = $b;
}

function GenerateError2($A1)
{
    GenerateError1("Test1");
}

GenerateError2("Test2");


Expected result:
----------------
I expect the final line in the backtrace to show a call of:
GenerateError2(Test2)


Actual result:
--------------
The final line in the backtrace shows a call of:
GenerateError2(Test1)