[akanevsky]

That could be done with just one query.

PHP Code:

$getusers = $db->query_read("SELECT userid, referrerid  FROM " . TABLE_PREFIX . "user WHERE userid IN (100, 200, 300)");

 while ($userinfo = $db->fetch_array($getusers))
 {
     $referrer_array["$userinfo[userid]"] = $userinfo['referrerid'];
 }

 print("<pre>");
 print_r($referrer_array);
 print("</pre>"); 


This code is not tested but should be working properly.

[offtopic] OMG I just saw you are 16!!! Wow! I'd never had expected that! I thought you were about 25+! OMG, most 16 year olds in Greece do not know how an opening tag of php is and generally they only care about playing games... Of course there are exeptions, like my bf which is in that age but still there is a huge difference... OMG, I still can't believe it! [/offtopic]

That's right, I am 16

EDIT:

Nevermind, I figured out another way to get the results I wanted

(lol)... How did you do it?