What is the significance of register_globals in PHP and how does it impact cookie handling?

The significance of register_globals in PHP is that it allows variables to be automatically registered as global variables, which can lead to security vulnerabilities such as injection attacks. When register_globals is enabled, it can impact cookie handling by making it easier for malicious users to manipulate variables through cookies. To solve this issue, it is recommended to disable register_globals in the PHP configuration settings.

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