Home  >  Article  >  Backend Development  >  How to count the number of people online through php

How to count the number of people online through php

墨辰丷
墨辰丷Original
2018-06-06 17:48:432285browse

This article mainly introduces the method of counting the number of people online through php. Interested friends can refer to it. I hope it will be helpful to everyone.

The code is as follows:

<?php 
$filename=&#39;online.txt&#39;;//数据文件 
$cookiename=&#39;VGOTCN_OnLineCount&#39;;//cookie名称 
$onlinetime=600;//在线有效时间,单位:秒 (即600等于10分钟) 
 
$online=file($filename); 
//PHP file() 函数把整个文件读入一个数组中。与 file_get_contents() 类似,不同的是 file() 将文件作为一个数组返回。数组中的每个单元都是文件中相应的一行,包括换行符在内。如果失败,则返回 false 
$nowtime=$_SERVER[&#39;REQUEST_TIME&#39;]; 
$nowonline=array(); 
//得到仍然有效的数据 
foreach($online as $line){ 
  $row=explode(&#39;|&#39;,$line); 
  $sesstime=trim($row[1]); 
  if(($nowtime - $sesstime)<=$onlinetime){//如果仍在有效时间内,则数据继续保存,否则被放弃不再统计 
    $nowonline[$row[0]]=$sesstime;//获取在线列表到数组,会话ID为键名,最后通信时间为键值 
  } 
} 
/* 
@创建访问者通信状态 
使用cookie通信 
COOKIE 将在关闭浏览器时失效,但如果不关闭浏览器,此 COOKIE 将一直有效,直到程序设置的在线时间超时 
*/ 
if(isset($_COOKIE[$cookiename])){//如果有COOKIE即并非初次访问则不添加人数并更新通信时间 
  $uid=$_COOKIE[$cookiename]; 
}else{//如果没有COOKIE即是初次访问 
  $vid=0;//初始化访问者ID 
  do{//给用户一个新ID 
    $vid++; 
    $uid=&#39;U&#39;.$vid; 
  }while(array_key_exists($uid,$nowonline)); 
  setcookie($cookiename,$uid); 
} 
$nowonline[$uid]=$nowtime;//更新现在的时间状态 
//统计现在在线人数 
$total_online=count($nowonline); 
//写入数据 
if($fp=@fopen($filename,&#39;w&#39;)){ 
  if(flock($fp,LOCK_EX)){ 
    rewind($fp); 
    foreach($nowonline as $fuid=>$ftime){ 
      $fline=$fuid.&#39;|&#39;.$ftime."\n"; 
      @fputs($fp,$fline); 
    } 
    flock($fp,LOCK_UN); 
    fclose($fp); 
  } 
} 
echo &#39;document.write("&#39;.$total_online.&#39;");&#39;;

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

PHP common file operation functions and example analysis

php method to obtain file suffix name

PHP method to get the year, month, day, hour, minute, and second between specified time periods

The above is the detailed content of How to count the number of people online through php. 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