FirePHP offers not only ability to monitor errors in log, but also displays other information as a script progresses and dumps value of an array when desired. I

FirePHP offers not only ability to monitor errors in log, but also displays other information as a script progresses and dumps value of an array when desired. In addition you can turn on/off all its reporting at with one statement at beginning of code. Quite handy for use in PHP development - or in understanding code you inherit from someone else. Works for me!