Re: Re: Allowing is_* functions to accept multiple parameters

> i.e. is_null($a, $b, $c) would be the same as is_null($a) && is_null($b) > && is_null($c) Note that this would not be semantically equivalent in this form, even if is_null() did accept multiple parameters, because of the short-circuiting with &&: <?php function are_null() { foreach (func_get_args() as $a) { if ($a !== null) { return false; } } return true; } function destroy_data() { echo "DESTROYING DATA\n"; } // old form: short-circuited; data is not destroyed if (is_null(null) && is_null(false) && is_null(destroy_data())) { echo "All null.\n"; } else { echo "Not null.\n"; } echo "----\n"; // proposed form: no short-circuit; parameters are evaluated at call time and data is destroyed if (are_null(null, false, destroy_data())) { echo "Still null.\n"; } else { echo "Still not null.\n"; }