如何用PHP统计网站在线人数

这篇文章主要介绍了php实现统计网站在线人数的方法,通过获取服务器端网络参数及文本文件读写实现统计在线人数的功能,非常简单实用,需要的朋友可以参考下

<?php
function getIpAddress() { // 取得当前用户的IP地址
 if (getenv(&#39;HTTP_CLIENT_IP&#39;)) {
 $ip = getenv(&#39;HTTP_CLIENT_IP&#39;);
 } elseif (getenv(&#39;HTTP_X_FORWARDED_FOR&#39;)) {
 $ip = getenv(&#39;HTTP_X_FORWARDED_FOR&#39;);
 } elseif (getenv(&#39;REMOTE_ADDR&#39;)) {
 $ip = getenv(&#39;REMOTE_ADDR&#39;);
 } else {
 $ip = $_SERVER[&#39;REMOE_ADDR&#39;];
 } 
 return $ip;
} 
function writeover($filename,$data,$method = &#39;w&#39;,$chmod = 0){
 $handle = fopen($filename, $method);
 !handle && die("文件打开失败");
 flock($handle, LOCK_EX);
 fwrite($handle, $data);
 flock($handle, LOCK_UN);
 fclose($handle);
 $chmod && @chmod($filename, 0777);
} 
function count_online_num($time, $ip) {
 $fileCount = &#39;./count.txt&#39;;
 $count = 0;
 $gap = 900; //15分钟不刷新页面就
 if (!file_exists($fileCount)) {
 $str = $time . "\t" . $ip . "\r\n";
 writeover($fileCount, $str, &#39;w&#39;, 1);
 $count = 1;
 } else {
 $arr = file($fileCount);
 $flag = 0;
 foreach($arr as $key => $val) {
  $val= trim($val);
  if ($val != "") {
  list($when, $seti) = explode("\t", $val);
  if ($seti ==$ip) {
   $arr[$key] = $time . "\t" . $seti;
   $flag = 1;
  } else {
   $currentTime = time();
   if ($currentTime - $when > 900) {
   unset($arr[$key]);
   }else{
   $arr[$key]=$val;
   }
  } 
  } 
 } 
 if ($flag == 0) {
  array_push($arr, $time . "\t" . $ip);
 } 
 $count = count($arr);
 $str = implode("\r\n", $arr);
 $str.="\r\n";
 writeover($fileCount, $str, &#39;w&#39;, 0);
 unset($arr);
 } 
 return $count;
} 
$time = time();
$ip = getIpAddress();
$online_num = count_online_num($time,$ip);
echo $online_num;
?>

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