If you are unable to access the $_COOKIE global variable inside a PHP function, there are a few things that could be causing the issue.

Firstly, make sure that the cookie has been set before the function is called. Cookies are sent to the browser by the server and are stored on the client-side, so if the cookie is not set before the function is called, it won’t be available to the function.

Secondly, ensure that the cookies are enabled on the client-side, If cookies are disabled on the client-side, the $_COOKIE variable will not be available to your PHP script.

Thirdly, check if the function is defined before the page is starting to load. If you define the function after the cookie is set, it will not be able to access the cookie.

Finally, you could try using the $_REQUEST variable to access the cookie, as it can access both $_COOKIE and $_POST data. However, this is not recommended as it can create security vulnerabilities.

If you are still not able to access the cookie, you can check the PHP error log to see if there are any errors that may help you diagnose the issue.

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