Is PHP Enabled?
Before starting anything in .php or any kind of scripts you may want to make sure that your hosting supports .php
Just Copy + Paste this code into notepad:
<? phpinfo(); ?>
save it as test.php, upload it to you're FTP then run it in you're browser (http://youdomain.com/test.php)
If a whole bunch of .php information comes up then this means .php is enabled :)