What potential pitfalls are associated with having register_globals set to 'on' in PHP?

Having register_globals set to 'on' in PHP can lead to security vulnerabilities such as injection attacks and variable overwriting. To mitigate these risks, it is recommended to disable register_globals in the PHP configuration settings. This can be done by setting register_globals = off in the php.ini file or using .htaccess file.

// Disable register_globals in php.ini
// Add this line to the php.ini file
register_globals = off;