Re: RFC: blank() Function as a Complement to empty()

>If this can still be implemented in userland you don't need logic integrated at low level Afaik it cannot be implemented in userland today. The closest you can get today is to use reference hacks, which introduce side-effects, like if you do function blank(&$value){...} blank($_POST['foo']) and foo doesn't exist, the & ref will *create* foo with null, like var_dump($_POST); // array(0) {} blank($_POST['foo']); var_dump($_POST); // array(1) {["foo"]=>NULL} But maybe we could make it possible like function blank(#[\AllowUndeclared] $value){...} var_dump($_POST); // array(0) {} blank($_POST['foo']); var_dump($_POST); // array(0) {}