In what ways can the PHP configuration setting for register globals impact the functionality and security of PHP scripts, and what are the recommended practices for handling this setting?

The PHP configuration setting for register globals can impact the functionality and security of PHP scripts by potentially allowing user input to overwrite variables in the script, leading to security vulnerabilities such as injection attacks. It is recommended to disable register globals in the PHP configuration and instead use superglobal arrays like $_GET, $_POST, and $_SESSION to access user input securely.

// Disable register globals in php.ini file
register_globals = Off;