Is there a simple \"Web interface\" to running PHPUnit test suites? i.e. a PHP script that runs the test on the command line, and outputs a nicely formatted HTML result.
You can use Jenkins to run any kind of tasks including PHPUnit tests. It can automatically checkout your app, run the tests, build a HTML report and even email you if the build fails.
Here's the templates you need to setup Jenkins to build a bunch of interesting reports and stats from your project.