What is the difference between using $HTTP_GET_VARS["variablenname"] and $_GET['variablenname'] to access data from a hyperlink in PHP?

The difference between using $HTTP_GET_VARS["variablename"] and $_GET['variablename'] is that $HTTP_GET_VARS is deprecated in newer versions of PHP and should not be used. It is recommended to use $_GET instead to access data from a hyperlink in PHP.

// Using $_GET to access data from a hyperlink in PHP
$variable = $_GET['variablename'];