Then you will need to install php4-sessions or php5-session whichever you are using to clean this up. You can install it by going to the ports directory[error] PHP Fatal error: Call to undefined function: session_name() in
For linux users if you are using the source recompile with session or use the php4-session RPMs get on from FreshRPMS http://www.freshrpms.net#cd /usr/ports/www/php4-sessions
#make install clean
#/usr/local/sbin/apachectl restart
if you have a custom script to restart apache use it
It just a little shamsham on FreeBSD that I encountered.