How to fix “set SameSite cookie to none” warning?

Question

I created a chrome extension and from popup.js I called PHP script (Using Xhttprequest) that reads the cookie. Like this:

$cookie_name = \"mycookie\";

if(is         


        

Answer 1

>= PHP 7.3

setcookie('key', 'value', ['samesite' => 'None', 'secure' => true]);

< PHP 7.3

exploit the path
setcookie('key', 'value', time()+(7*24*3600), "/; SameSite=None; Secure");

Emitting javascript

echo "";