PHP - how to enable?

Hello everybody!

Quick question about php.

I’m currently rocking the default setup, tried to add a handy file manager .php file to the rtorrent and deluge folders.

Instead of executing the php, the webserver is just listing the code.

I found a guide that told me to enable PHP by removing a comment line in:

/etc/apache2/httpd.conf

that file doesn’t exist - so I’m assuming it’s either an old guide, or quickbox has a custom file. Either way I shouldn’t be screwing around without checking with the powers that be first…

Thanks in advance & Happy Holidays!

Edit:
Ubuntu server 16.04