How can I troubleshoot an issue where a cookie is not being set in PHP?

Issue: If a cookie is not being set in PHP, it could be due to incorrect parameters being passed to the setcookie() function, such as an expired expiration time or an incorrect path. To troubleshoot this issue, double-check the parameters being passed to the setcookie() function and ensure they are correct. PHP code snippet:

// Set a cookie with a name, value, expiration time, path, and domain
setcookie("cookie_name", "cookie_value", time() + 3600, "/", "example.com");