How can the use of register_globals impact the functionality and security of PHP scripts, and what measures should be taken to address this issue?

The use of register_globals in PHP can impact the functionality and security of scripts by allowing input data to be automatically turned into variables, potentially leading to security vulnerabilities such as injection attacks. To address this issue, developers should disable register_globals in their PHP configuration and use superglobal arrays like $_GET, $_POST, and $_SESSION to access input data securely.

// Disable register_globals in php.ini file
// Add the following line to php.ini:
// register_globals = Off