Browser tries to download PHP files

Greetings, I have a quick question. When you go to my website,, and try to access a php file, it will try to download that file instead of opening it in a browser. This happens on all browsers from any location. What gives? How do I fix this? It only does it with php files, not with a .png, etc.

The php pages, do they have the php extention or the html extention? If it is htm or html rename to php.