How can one ensure that a cookie is accessible globally within a domain in PHP?

To ensure that a cookie is accessible globally within a domain in PHP, you need to set the cookie's path parameter to '/' so that it is available to all directories within the domain. This allows the cookie to be accessed by any script within the domain, regardless of its location.

// Set a cookie with a global scope within the domain
setcookie('global_cookie', 'cookie_value', time() + 3600, '/');