PBL (aka PHP Bug lost) is a simple one-file script for use in any php websites that offers a console for debug and monitoring on your broser.
It's based on FirePHP and PHP Quick Profiler. You can send log messages to the console, view SQL Querys, memory usage, list of user and server vars, files included, automatic detection of ajax request (like FireBug)... etc.
Also PBL can send emails to the admin when a sql query fail or the app are using more memory or time that allowed. You can...