Undefined variable sessioncode in ..

[Rackers]

I've got an image verification code that doesn't seem to be working. It is returning a broken image so therefore isn't working 🙁. If I go directly to the script page i.e veryimage.php it gives me this error.

Undefined variable: sessioncode in /www/verifyimage.php on line 8

<?
session_start ();
session_register ('sessioncode');
$im = imagecreate (55, 15);
$bg = imagecolorallocate ($im, 255, 255, 255);
$textcolor = imagecolorallocate ($im, 0, 0, 255);
imagecolortransparent ($im, $bg);
imagestring ($im, 5, 0, 0, substr (strtoupper (md5 ('Mytext' . $sessioncode)), 0, 6), $textcolor);
imagepng ($im);
exit ();
?>

That is what I have, can anybody explain the problem to me?

Thankyou.

[bradgrafelman]

You shouldn't be using [man]session_register/man at all - it's been deprecated for a while in favor of the $_SESSION superglobal array.

Speaking of deprecated coding practices, you should also be using the full '<?php' tags, as the '<?' (and '<?=(expression)?>') short tags have been deprecated and disabled by default.