php实现统计IP数及在线人数的示例代码

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<?php
$file       = "count"; // 记数文件名称
$startno     = "1000";  // 起始数值
$tempfile     = "temp"; 
$t_now  = time();
$t_array = getdate($t_now);
$day   = $t_array['mday'];
$mon   = $t_array['mon'];
$year  = $t_array['year'];
if (file_exists("$file")) {
    $count_info=file("$file");
    $c_info = explode(",", $count_info[0]);
    $total_c=$c_info[0];
    $yesterday_c=$c_info[1];
    $today_c=$c_info[2];
    $lastday=$c_info[3];
} else {
    $total_c="$startno";
    $yesterday_c="0";
    $today_c="0";
    $lastday="0";
}
 
if ( !isset($HTTP_COOKIE_VARS["countcookie"]) || $HTTP_COOKIE_VARS["countcookie"] != $day) {
    $your_c=1;
    $lockfile=fopen("temp","a");
    flock($lockfile,3);
    putenv('TZ=JST-9');
 
    $t_array2 = getdate($t_now-24*3600);
    $day2=$t_array2['mday'];
    $mon2=$t_array2['mon'];
    $year2=$t_array2['year'];
    $today = "$year-$mon-$day";
    $yesterday = "$year2-$mon2-$day2";
    if ($today != $lastday) {
  
           if ($yesterday != $lastday) $yesterday_c = "0";
               else $yesterday_c = $today_c;
  
        $today_c = 0;
        $lastday = $today;
    }
    $total_c++;
    $today_c++;
    $total_c   = sprintf("%06d", $total_c);
    $today_c   = sprintf("%06d", $today_c);
    $yesterday_c = sprintf("%06d", $yesterday_c);
    setcookie("countcookie","$day",$t_now+43200);
    $fp=fopen("$file","w");
    fputs($fp, "$total_c,$yesterday_c,$today_c,$lastday");
    fclose($fp);
    fclose($lockfile);
}
if ( empty( $your_c ) ) $your_c = 1;
setcookie("yourcount",$your_c+1,$t_now+43200);
$your_c = sprintf("%06d", $your_c);
//////////////////////////开始统计在线
$filename="online";
$onlinetime=600; //同一IP在线时间，单位：秒
$online_id=file($filename);
$total_online=count($online_id);
$ip=getenv("REMOTE_ADDR");
$nowtime=time();
 for($i=0;$i<$total_online;$i++){
     $oldip=explode("||",$online_id[$i]);
     $hasonlinetime=$nowtime-$oldip[0];
 if($hasonlinetime<$onlinetime and $ip!=$oldip[1]) $nowonline[]=$online_id[$i];
                 }
     $nowonline[]=$nowtime."||".$ip."||";
     $total_online=count($nowonline);
     $fp=fopen($filename,"w");
     rewind($fp);
     for($i=0;$i<$total_online;$i++){
     fputs($fp,$nowonline[$i]);
     fputs($fp,"n");
                 }
 fclose($fp);
   if($total_online==0)$total_online=1;
        $total_online = sprintf("%06d", $total_online);
///////////////////////////////////////////////////////
echo "document.write("·总IP访问:".$total_c."");";
echo "document.write("<br>");";
echo "document.write("·昨日访问:".$yesterday_c."");";
echo "document.write("<br>");";
echo "document.write("今日IP:".$today_c."");";
echo "document.write("&nbsp;");";
echo "document.write("·您 访 问:".$your_c."");";
echo "document.write("<br>");";
echo "document.write("当前在线:".$total_online."");";
exit;
?>

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<script src="/php/count.php"></script>