What are the implications of using register_globals in PHP scripts and how can this feature be safely disabled for improved security?

Using register_globals in PHP scripts can lead to security vulnerabilities such as variable injection and overwrite attacks. To improve security, this feature should be disabled by setting the "register_globals" directive to "Off" in the php.ini configuration file or using the ini_set() function in the PHP script itself.

// Disable register_globals in PHP script
ini_set('register_globals', 0);