What potential issues could arise when trying to destroy session variables and cookies in PHP, especially when transitioning from a local environment like XAMPP to an online server?

When transitioning from a local environment like XAMPP to an online server, potential issues could arise when trying to destroy session variables and cookies in PHP due to differences in server configurations. To solve this, make sure to call session_start() before attempting to destroy session variables and cookies, and use session_unset() to clear session variables and set the expiration time of cookies in the past to delete them. 

session_start();
session_unset();
$_SESSION = array();
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}
session_destroy();

Keywords

session variables cookies destroy PHP online server

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