What are the potential pitfalls of relying on register_globals being set to "on" in a PHP environment?

Relying on register_globals being set to "on" in a PHP environment can lead to security vulnerabilities such as variable injection attacks and make it harder to track the source of data. It is recommended to disable register_globals and instead use superglobal arrays like $_GET, $_POST, and $_REQUEST to access form data and other variables.

// Disable register_globals in php.ini
register_globals = Off;