SquirrelMail shows blank page after login

[Ulli Horlacher]

I have installed squirrelmail on Ubuntu 14.04, together with apache2.
After login with https://MYSERVER/squirrelmail/src/login.php I get a blank
page. Looking at the source code in the web brwoeser, there is just a "1"
- that's all.

I found a workaround: I added to /etc/squirrelmail/config.php the code:

if (!function_exists('session_unregister')) {
  function session_unregister($var) { unset($_SESSION[$var]); }
}

With this extra code, squirrelmail works as expected.

It looks the Ubuntu packages squirrelmail and libapache2-mod-php5 are
incompatible. See
http://stackoverflow.com/questions/23758202/call-to-undefined-function-session-unregister-when-trying-output
for more information.

[Ulli Horlacher (framstag)]

I forgot:

Before adding the extra code to /etc/squirrelmail/config.php I found in /var/log/apache2/error.log :

[Mon May 18 08:45:36.075168 2015] [:error] [pid 24923] [client 92.203.28.105:59703] PHP Fatal error: Call to undefined function session_unregister() in /home/httpd/htdocs/squirrelmail/functions/global.php on line 265, referer: https://localhost/squirrelmail/src/login.php