Monolog is a simple logging library for PHP 5.3+, inspired by Python’s Logbook. It is namespaced, tested, PSR-0 compliant and all of these good things. It is fairly simple to use in any project and logs to files, syslog, FirePHP, sends emails or any combination of the above. Of course it’s extensible, and more handlers are planned for 1.1. One of the notable features is the FingersCrossedHandler.