How can changes in server parameters, like register_globals, affect the functionality of a PHP script?

Changes in server parameters, such as turning off the register_globals setting, can affect the functionality of a PHP script by preventing the script from accessing variables passed through the URL or forms directly. This can lead to errors or unexpected behavior in the script. To solve this issue, you can use the $_GET, $_POST, or $_REQUEST superglobals to access these variables instead.

// Accessing variables passed through the URL using $_GET superglobal
$variable = $_GET['variable_name'];