Automated GUI Testing for Symfony created Websites

I am working on a PHP based Website written in the symfony framework. I want to do automated GUI testing. All I know about testing is PHPUnit tests which won't apply for my GUI application. Is there a particular testing framework excepts Selenium 1 or 2. I'm looking for a kind of a easy-to-understand-framework which ist able to do the testings repeatedly. Are there any good out there which fit good to my php symfony website? Which ones are easy to use (I need to do testing but I don't have a lot of time for that, however, I don't want to ignore that). The website is not to complex. but it has different subsites for different user-roles with different permissions. So is there a simple framework that will let me test my application fast and in a strong way to find bugs and create a test report?