What are the potential pitfalls of using the "register_globals" setting in PHP?

Using the "register_globals" setting in PHP can be a security risk as it can lead to variables being overwritten or manipulated by external sources. This can potentially allow for malicious attacks such as injection attacks or data manipulation. It is recommended to disable this setting and instead use superglobal arrays like $_GET, $_POST, and $_REQUEST to access user input securely.

// Disable register_globals in PHP
// Add this line to your php.ini file
register_globals = Off;