How to view an original php page script?

[Malborojones]

I know that php pages are executed on the server they're kept on and the page we see is the result of the script but is there any way to view the script of the php file before it's altered?
E.g. blahblah.php has html in it that was created by the php file, the original code of the php file cant be seen by right clicking and pressing view source, it just shows the html of the created webpage.

Thanks for any help, Mal.