stupid array question

I have the following code which should increment the value of the array $iplist if there is a value there.  When I walk the array at the end, all the values = 1.  What am i doing wrong? --Curtis while (!feof($INPUTFILE))  {    $chunks = fgetcsv($INPUTFILE, " ", '"');    $firstpart = explode(" ", $chunks[0]);    $ipaddress = $firstpart[0];    $agent = $chunks[4]; //   print (stripos($agent, "compatible; MSIE 6.0; Windows NT 5.1; SV1")."\n");    if (stripos($agent, "compatible; MSIE 6.0; Windows NT 5.1; SV1") > 0)    {        $iplist[$ipaddress]++;        //print("$ipaddress\t$agent\n");    }    while (list($key, $value) = each($iplist))    {      print("$key\t$value\n");    }   }