Superglobals variables in php are the built-in array. They are available in every scope. You can access the superglobal variable inside and outside the methods.

PHP Superglobals variables:

1. $_COOKIE

   contains values provided to the script via HTTP cookies.

2. $_GET

   contains variables submitted to the script using HTTP get method.

3. $_POST

   contains variables submitted to the script using HTTP post method.

4. $_REQUEST

   combined array containing values from the $_GET, $_POST, and $_COOKIES superglobal arrays.

5. $_ENV

   contains keys and values set by the scripts shell.

6. $_FILES

   contains information about uploaded files.

7. $_SERVER

   contains variables made available by the server.

8. $GLOBALS

   contains all the global variables associated with the current script.