Popescu Valentin has submitted a tool that he and and Radu Gasler have created to help you run your PHPUnit tests via a web interface.

I made a web interface for runing PHPUnit test suites and seeing the results in a cool environment of AJAX. Features Runing speciffic tests or whole suite, seeing the errors and thrown exceptions connected to the test that thrown them, ability to see the code coverage result for the test suite. All these done in an interactive interface allowing run of the tests where the user can not interract with the system command line (web server). The software is totally free.

You can find complete details about the tool (and downloads) on its SourceForge page (as well as donate if you like it!)