How can one effectively test if cookies are functioning properly in a PHP application, especially when dealing with session management?

To effectively test if cookies are functioning properly in a PHP application, especially when dealing with session management, you can set a test cookie and check if it is being properly set and retrieved. This can be done by setting a cookie with a unique name and value, then checking if the cookie exists and has the correct value when retrieving it.

// Set a test cookie
setcookie("test_cookie", "test_value", time() + 3600);

// Check if the cookie is set and has the correct value
if(isset($_COOKIE['test_cookie']) && $_COOKIE['test_cookie'] == 'test_value'){
    echo "Cookies are functioning properly.";
} else {
    echo "Cookies are not functioning properly.";
}