CAPTCHA plugin with captcha_php backend and PHP 5.4 - no image

Hi all,

I think I found a small issue with CAPTCHA plugin with captcha_php backend
using PHP 5.4.x. The issue is that the captcha image does not display on
the login page. The error in the apache error log:
-----------------------------------------------------------------------------
[Sun Jan 20 16:37:12 2013] [error] [client X.X.X.X] PHP Warning: 
imagejpeg(): Filename cannot be empty in
<SQUIRRELMAIL_HOME_DIR_PATH>/plugins/captcha/backends/captcha_php/captcha.php
on line 328
-----------------------------------------------------------------------------

I didn't have the issue with PHP 5.3.x. It seems that the imagejpeg()
function behaviour has been changed with PHP 5.4.x.

The fix is simple (edit line 328 in
<SQUIRRELMAIL_HOME_DIR_PATH>/plugins/captcha/backends/captcha_php/captcha.php):
----------------------------------------------
   from: imagejpeg($img, "", (int)$quality);
     to: imagejpeg($img, NULL, (int)$quality);
----------------------------------------------

Probably this could be fixed in the next version of captch plugin if the
author thinks that's an issue. I am not sure if it will work with PHP
5.3.x or lower.

Thanks & Best Regards,

Boyan Boychev
SquirrelMail 1.4.22
PHP Version 5.4.8--pl0-gentoo
GD Version bundled (2.0.34 compatible)
CAPTCHA 1.2.3


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