[otrs] Installing PHPMyAdmin alongside OTRS

Hi chaps, I'm trying to install phpmyadmin alongside OTRS for easier management of the DB. I've installed PHP and put the PHPMyAdmin directory into my htdocs folder in OTRS/Apache, but when I try to open http://localhost/phpmyadmin/index.phpI'm just greeted with the actual PHP code in my web browser. Anyone got any ideas what I need to do? Thanks, David