How does the usage of register_globals impact the handling of variables like $PHPSESSID in PHP scripts?

When register_globals is enabled in PHP, it automatically creates global variables based on input parameters. This can lead to security vulnerabilities as it allows external input to overwrite variables, including sensitive ones like $PHPSESSID. To solve this issue, it is recommended to disable register_globals in the PHP configuration.

// Disable register_globals in php.ini configuration file
// Set register_globals = Off