Django-python安装后Apache-PHP无法正常工作

I want to install Django Framework on my Ubuntu(12.04)laptop, already running a Apache-Php-MySQL environment.

I followed this tutorial:http://www.lennu.net/2012/05/14/django-deployement-installation-to-ubuntu-12-dot-04-server/

I stopped at mod_WSGI installation to check if my old php project would not be affected from new apache config...well they are! When I try to run them browser not show sites but makes me download the file(ex index.php) of project and show nothing!

What is going on here??