How does the removal of "Register Globals" support in PHP 5.4 impact the security and functionality of PHP scripts?

The removal of "Register Globals" support in PHP 5.4 improves the security of PHP scripts by preventing attackers from easily manipulating variables through the URL or form inputs. This change also promotes better coding practices by encouraging developers to use superglobal arrays like $_GET, $_POST, and $_REQUEST to access user input.

// Before PHP 5.4
$var_value = $_GET['var_name'];

// After PHP 5.4
$var_value = isset($_GET['var_name']) ? $_GET['var_name'] : null;