helper.php

<?php

if (!function_exists('getClientAddress')) {
 
    /**
     * @return string|null
     */
    function getClientAddress(): ?string
    {
        return $_SERVER['HTTP_CLIENT_IP']
            ?? $_SERVER['HTTP_X_FORWARDED_FOR']
            ?? $_SERVER['HTTP_X_FORWARDED']
            ?? $_SERVER['HTTP_FORWARDED_FOR']
            ?? $_SERVER['HTTP_FORWARDED']
            ?? $_SERVER['REMOTE_ADDR']
            ?? null;
    }
}