What is the significance of the "register_globals" setting in PHP and how does it affect script functionality?

The "register_globals" setting in PHP allows variables to be automatically registered as global variables, which can lead to security vulnerabilities such as variable injection attacks. To prevent these vulnerabilities, it is recommended to disable the "register_globals" setting in the PHP configuration.

// Disable register_globals in PHP configuration
// This can be done by setting the following line in php.ini file:
// register_globals = Off