detect a script crash

Hi all, Bit of a curve ball here (at least I couldn't find anything on Google yet) but I need a way to be able to detect if a particular php script crashes and generate some form of report from it. Here is the system setup: CentOS system, with the PHP scripts running as CLI called from a bash script as part of a daemon. The setup is already all in-place for an existing system, I've just been asked to implement a crash detection system. I know I can monitor the error logs with tail() to detect errors, but that is likely not going to be the main issue which needs tracking. I've found a bit of documentation online for pcntl_signal() which I believe should do the trick, but I can't seem to find just a plain old list of signal monikers and their meanings. Does anyone have any light to shed on this? Also, any other input/suggestions would be more than welcome. Thanks, Ash http://www.ashleysheridan.co.uk