What is the significance of the PHP configuration setting "register_globals" in relation to passing form data?

The "register_globals" setting in PHP determines whether global variables from form data, cookies, and server variables are automatically registered as global variables in the script. This can lead to security vulnerabilities and unexpected behavior, as it can allow attackers to manipulate variables and access sensitive data. It is recommended to disable this setting and instead use superglobal arrays like $_POST, $_GET, and $_COOKIE to access form data securely.

// Disable register_globals in PHP configuration
// This should be set in php.ini or .htaccess
// php.ini: register_globals = Off
// .htaccess: php_flag register_globals Off