What potential security risks are associated with using "register globals" in PHP version 5 and how can they be mitigated?

Using "register globals" in PHP version 5 can lead to security vulnerabilities such as variable injection attacks and data manipulation. To mitigate these risks, it is recommended to disable the "register globals" setting in the php.ini file or use the $_GET, $_POST, and $_REQUEST superglobals to access user input securely.

// Disable register globals in php.ini file
// Or use superglobals to access user input securely
$user_input = $_POST['user_input'];