php7 void return type not working?

Question

I have a problem with return types in php7, specially "void".

it works with all other types, int, string, null, bool, class objects.

but when i use void it expecting me to return an instance of object void but in reality it should not expect any return as thats what void is for.

note: I'm running PHP 7.0.3

here is the code:

   public static function setResponseCode(int $code) : void     {         http_response_code($code);      } 

and error message is:

Uncaught TypeError: Return value of CodeBase\HttpRequester::setResponseCode() must be an instance of void, none returned in /var/www/html/src/HttpRequester.php:86 Stack trace: #0 /var/www/html/index.php(103): CodeBase\HttpRequester::setResponseCode(500) #1 {main} thrown in /var/www/html/src/HttpRequester.php on line 86

Answer 1

Void return types are for PHP 7.1 (which had not yet been released when you asked this). From the RFC

Version: 0.2.1
Date: 2015-02-14 (v0.1, later withdrawn), 2015-10-14 (v0.2, revival)
Author: Andrea Faulds, [email protected]
Status: Implemented (PHP 7.1)

Answer 2

I've just found the answer here: https://wiki.php.net/rfc/void_return_type

It will be a feature in PHP 7.1