How can frame redirection impact the functionality of setcookie in PHP when setting cookies on different domains?

Frame redirection can impact the functionality of setcookie in PHP when setting cookies on different domains because browsers may block third-party cookies in iframes due to security concerns. To solve this issue, you can use the header function to set cookies on the top-level domain instead of relying on setcookie within an iframe.

// Set cookie on the top-level domain
header("Set-Cookie: cookie_name=cookie_value; domain=yourdomain.com; path=/; secure; HttpOnly");