$sql=mysql_query("SELECT * FROM `on` WHERE `time` > ".(time()-300)." || `sid`='".session_id()."'"); if(mysql_fetch_array($sql)) { mysql_query("UPDATE `on` SET `sid`='".session_id()."', `host`=`host`+1, `time`='".time()."' WHERE `time` > ".(time()-300)." || `sid`='".session_id()."'"); } else { mysql_query("INSERT INTO `on` SET `sid`='".session_id()."', `host`=`host`+1, `time`='".time()."'"); }