Home  >  Article  >  Backend Development  >  PHP counts the number of people online on the website

PHP counts the number of people online on the website

*文
*文Original
2017-12-26 14:52:202898browse

How does php count the number of people online on the website? This article mainly introduces the method of counting the number of people online on a website in PHP. It implements the function of counting the number of people online by obtaining server-side network parameters and reading and writing text files. I hope to be helpful.

The specific implementation method is as follows:


<?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;
?>

Related recommendations:

PHP solution Session file blocking

Use PHP to process non-existent image resources

PHP polymorphism With dynamic binding

The above is the detailed content of PHP counts the number of people online on the website. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn