WampServer

I can´t get all warnings to display at my WAMP test server: The following code shall result in a few more warnings than I got from WAMP:
<?php
error_reporting( E_ALL | E_STRICT | E_WARNING);
echo "D";
session_start();
$_SESSION["s"] = y;
setcookie();
setcookie(1);
?>
Expected result is (on live server):
D
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at XXX:3) in XXX on line 4

Notice: Use of undefined constant y - assumed 'y' in XXX on line 5

Warning: setcookie() expects at least 1 parameter, 0 given in XXX on line 6

Warning: Cannot modify header information - headers already sent by (output started at XXX:3) in XXX on line 7


Though on WAMP my output is:
D
Notice: Use of undefined constant y - assumed 'y' in YYY on line 5

Warning: setcookie() expects at least 1 parameter, 0 given in YYY on line 6


How can I fix so WAMP displays EVERY warning and not just SOME warnings.

Just set error reporting to E_ALL