How does browser caching affect the availability and recognition of cookies in PHP?

Browser caching can affect the availability and recognition of cookies in PHP because cached pages may not reflect the most recent state of the cookies. To ensure cookies are recognized and available, you can add cache-control headers to prevent caching of specific pages or resources.

// Prevent caching of the page
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");