What security implications are associated with the use of register_globals in PHP, and how can developers ensure secure coding practices when dealing with global variables like in the mentioned scenario?

Using register_globals in PHP can lead to security vulnerabilities such as injection attacks and data manipulation. To ensure secure coding practices when dealing with global variables, developers should avoid using register_globals altogether and instead use superglobal arrays like $_GET, $_POST, and $_COOKIE to access user input.

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