user_agent_and_more.php

<?php
    $session_vars_to_return = array('HTTP_ACCEPT', 'HTTP_ACCEPT_CHARSET','HTTP_ACCEPT_ENCODING','HTTP_ACCEPT_LANGUAGE','HTTP_CONNECTION','HTTP_USER_AGENT','HTTP_X_FORWARDED_FOR','HTTP_COOKIE','HTTP_REFERER');
    foreach($session_vars_to_return as $session_var){
        if (isset($_SERVER[$session_var])){
            echo '<b class="var">'.$session_var.'</b>:'.$_SERVER[$session_var].'<br/>';
        }
    }
?>