로그를 계산하고 정렬하는 PHP 프로그램

function topIp($logfile,$length=3){
    $handle = fopen($logfile, 'r');
    $countip = array();//统计ip
    if ($handle) {
        while ($buffer = fgets($handle)) {//逐行读取文件
            $arr = preg_split('/t/',$buffer);
            if(strstr($arr[2],"small")){//小图
                //ip为键，出现次数为指
                $countip[$arr[1]] = $countip[$arr[1]] ?   $countip[$arr[1]] : 1;
            }
        }
        fclose($handle);
        arsort($countip);//ip出现次数倒序
        return array_slice($countip,0,$length);//提取
    }
}
$topips = topIp('20121030.log',3);
var_dump($topips);
?>

输出的结果： array(3) { ["192.168.1.110"]=> int(10) ["192.168.1.108"]=> int(8) ["192.168.1.120"]=> int(7) }