new function last_????_error()

Hi all, i think PHP lacks one important function. It should be possible for a PHP script to determine if a function failed due to SAFE MODE restrictions or Open Base Dir. Right now on error all functions simply return FALSE. I would like to add some function with the following behaviour: checkuid: -> FALSE last_????_error() = FAILED_DUE_SAFE_MODE TRUE last_????_error() = OK openbasedir: -> FALSE last_????_error() = FAILED_DUE_BASEDIR TRUE last_????_error() = OK This function will be very usefull because a script could then tell the user that is has no access and because of what... Right now only the ugly error messages tell that. My only problem now is: HOW to call the function and HOW to call the 3 Constants??? Stefan Esser