For those in barely need of php threadsafety – http://gcov.php.net/ . This page is deticated to automatic PHP code coverage testing. Every day a current cvs snapshot will be build on the machine and tested. After all tests are done the results are visualized along with a code coverage analysis.

Last time I’ve checked it was about 50% coverage for main php distribution. Exclude unused extensions and wait till your php will be “100% covered”.