Log error question

[Stéphane RIFF]

Hello,

I have some problem on a phpmapscript application. Some time it seems that
$map->draw() crash for unknown reason. It's not logical (I think), it 
happened
randomly but only when a specific layer is on.

What i want to know is to debug phpmapscript, so i made an error_handler 
for my php script
but i didn't log the phpmapscript errors. So i tried map DEBUG but the 
informations
are very orientated for time performance. Is it possible to log only 
crash ???

Hope this clear...
Thanks
Steff