> Empty is merely the function equivalent of the not (!) operator. Nope! "empty" is an operator too: var_dump(array_map('empty', [null, '', 5, false]));

> Empty is merely the function equivalent of the not (!) operator. Nope! "empty" is an operator too: var_dump(array_map('empty', [null, '', 5, false])); PHP Warning: array_map() expects parameter 1 to be a valid callback, function 'empty' not found or invalid function name NULL See https://bugs.php.net/bug.php?id=66368 https://bugs.php.net/bug.php?id=66368