Description:
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Something I've been longing to see is a way to catch fatal errors so that PHP doesn't print out errors to the clients or worse, nothing at all. Obviously this isn't possible as the engine might be in an unstable state and it would be unsafe to continue.

But I figure if the internals of PHP can handle it, would it not be possible to upon fatal errors run a pre-defined script filename (settable via iniset/putenv as well) using a new instance of the engine with the error available (perhaps the backtrace as well) in $_SERVER or wherever? So that you could apply your own error logging and output.

So instead of:
runscript IF fatalerror THEN printfatal END
You would get something like:
runscript IF fatalerror THEN runhandler IF fatalerror THEN printfatal END END

This would be a blessing for both custom debugging functionality, giving clients useful errors and being able to log these actions using custom utilities (most people don't have access or log php errors in the http-log). As in fact, the common fatal errors are that you have called a non-existant function, worked on a bad object or put in a bad character and not the engine going rogue.