Are there any improvements that can be made to the getAddrField() function in the core.php file to enhance user experience and data security?

The getAddrField() function in the core.php file can be improved by adding input validation to sanitize user input and prevent SQL injection attacks. This can enhance user experience by ensuring that only valid data is retrieved and processed, while also improving data security.

function getAddrField($conn, $field) {
    if(isset($_GET[$field])) {
        $input = mysqli_real_escape_string($conn, $_GET[$field]);
        return $input;
    } else {
        return null;
    }
}