PHP program to count and sort logs

function topIp($logfile,$length=3){
 $handle = fopen($logfile, 'r');
 $countip = array();//statistics ip
 if ($handle) {
 while ($buffer = fgets($handle)) {//Read the file line by line
 $arr = preg_split('/t/',$buffer);
 if(strstr($arr[2 ],"small")){//Small picture
 //ip is the key, the number of occurrences is
 $countip[$arr[1]] = $countip[$arr[1]] ? ++$countip[$ arr[1]] : 1;
 }
 }
 fclose($handle);
 arsort($countip);//The number of ip occurrences is in reverse order
 return array_slice($countip,0,$length);//Extract
 }
}
$topips = topIp('20121030.log',3);
var_dump($topips);
?>

The output result: array(3) { ["192.168.1.110"]=> int(10) ["192.168.1.108"]=> int(8) ["192.168.1.120"]=> int(7) }