> > >> Currently, this is what's available for checking a variable's status >> without throwing any errors: >> >> Variable exists and !== NULL: isset( $var ) >> Variable === NULL or doesn't exist: !isset( $var ) >> Variable == NULL or doesn't exist: empty( $var ) >> Variable exists and != NULL: !empty( $var ) >> Variable exists (including NULL): ???? >> > > Yep, nothing exists for that; we have a whole bunch of `_exists()` > functions, but not e.g. `variable_exists()` or even a dedicated `exists` > opcode. > > >> Variable exists and === NULL: ???? >> > > That's simply `@$var === null` or `@is_null($var)` of course ;-) >
Is there any practical reason that you know of why 'exists' doesn't exist (maybe there's some reason why it shouldn't)? Or is it just something that never came up? If the latter, I wonder if there'd be any support for changing that. --Kris
