monolog
Homepage
https://github.com/Seldaek/monolog
What is it?
An open-source library that implements a logging framework for PHP, making managing logs and logging without default PHP functions a lot nicer.
Why did we choose it?
It's easy to use, conforms to standard logging practices, and is well maintained.
What do we use it for?
Back-end logging, to record errors and debugging information on the webservers to help us diagnose problems, track issues, and so forth.