How to get cookies for subdomain only?

Question

PHP

There is site.com and test.site.com. Each of them has "lang" cookies. If I go to the main site and then to the test one, I get two "lang" cookies (.site.com and .test.site.com). As far as I understand, which cookie is set first, that one is shown.
Can I, while on test.site.com, receive a cookie only from a subdomain (.test.site.com)? Or set cookie priority on a test site?

Answer 1

Read the setcookie documentation

// Для site.com
setcookie("TestCookie", 1, time() + 3600, "/");
// или
setcookie("TestCookie", 1, time() + 3600, "/", "site.com");
// или
setcookie("TestCookie", 1, time() + 3600, "/", "www.site.com");

// Для test.site.com
setcookie("TestCookie", 1, time() + 3600, "/", "test.site.com");