[php-src] Issue #8166: argument is reserved word

Issue: https://github.com/php/php-src/issues/8166 Comment Author: iluuu1994 empty() is not a real function so you can't use named parameters with it. https://www.php.net/manual/en/function.empty.php#refsect1-function.empty-notes > Note: Because this is a language construct and not a function, it cannot be called using > [variable functions](https://www.php.net/manual/en/functions.variable-functions.php). Maybe the docs can be improved but it's definitely not a bug.