Rate Limit Per Session


Hi, how can I have different rate limits per each Visitor?
The following php code works well, but when i’m trying to access page from different ip, i see the same “Rate Limit Exceeded” message.

$key = ‘xxx’;
$secret =‘xxx’;
$token= ‘xxx’;
$token_secret = ‘xxx’;

    // TwitterOAuth instance, with two new parameters we got in twitter_login.php  
$twitteroauth = new TwitterOAuth($key, $secret, $token, $token_secret);  
// Let's request the access token  
$access_token = $twitteroauth->getAccessToken(); 

$_SESSION['access_token'] = $access_token; 

echo $twitteroauth->get('followers/ids', array('screen_name' => 'Mega4alik'));