What are some potential reasons why the PHP cookie with expires 0 is not working on mobile devices?

The issue of the PHP cookie with expires 0 not working on mobile devices could be due to the way mobile browsers handle cookies. Some mobile browsers may not support cookies with an expires value of 0, causing the cookie to not be set properly. To solve this issue, you can set the cookie expiration to a specific time in the future instead of using 0.

setcookie("cookie_name", "cookie_value", time() + 3600, "/");