Are there specific considerations or configurations needed to access a PHP cookie in a subdomain?

When accessing a PHP cookie in a subdomain, you need to set the cookie domain parameter to the root domain of the subdomains you want to access the cookie from. This ensures that the cookie is accessible across all subdomains. You can achieve this by setting the domain parameter in the setcookie function to the root domain preceded by a dot (e.g., ".example.com").

setcookie('cookie_name', 'cookie_value', time() + 3600, '/', '.example.com');