set_error_handler and set_exception_handler behavior

Hi internals! Laruence and myself yesterday tried to slightly modify the set_error_handler behavior, but the change which we considered trivial was not perceived as such by others. So we are taking this to the ML. Current state of things: * set_error_handler(callback) and set_exception_handler(callback) will return the previous error/exception handler * set_exception_handler(NULL) will reset the exception handler (i.e. use the default PHP exception handler again) and return bool(true) * set_error_handler(NULL) throws an invalid argument error => inconsistent What we wanted to do: Allow the error handler being reset using set_error_handler(NULL). To be consistent with set_exception_handler(NULL) this was supposed to return bool(true). What people objected to: * Stas: The bool(true) return value does not really make sense. Instead the previous error/exception handler should be returned, as always. * Pierre: One shouldn't be able to reset the error/exception handler like that in any case. This behavior should be removed and instead there should be additional reset_error_handler() and reset_exception_handler() functions (and also get_error_handler() and get_exception_handler() if I got that right.) What I would do: Add support for set_error_handler(NULL) and change the return value of set_error_handler(NULL)+set_exception_handler(NULL) to the previous handler (i.e. Stas option). I implemented this option in this PR: https://github.com/php/php-src/pull/20 So, what are your opinions on this? Nikita