Cacti installation shows only PHP code [on hold]

I am installing Cacti on my server by following this tutorial http://siddou.mynetgear.com/2013/08/install-cacti-on-debian-7-wheezy/

All went well but when I fire up the web browser Cacti all I see is the source code of PHP.

I have tried to update and upgrade the system and it is running Debian Wheezy 32 bit.