How to accurately count the number of people online in php, how to count the number of people online in php_PHP tutorial

php accurate method of counting the number of people online, php counting the number of people online

This is a very accurate method of counting the number of people online through php. If you want to know how to implement it, please Read patiently.

<&#63;php 
$filename='online.txt';//数据文件 
$cookiename='VGOTCN_OnLineCount';//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['REQUEST_TIME']; 
$nowonline=array(); 
//得到仍然有效的数据 
foreach($online as $line){ 
  $row=explode('|',$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++; 
    $uid='U'.$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,'w')){ 
  if(flock($fp,LOCK_EX)){ 
    rewind($fp); 
    foreach($nowonline as $fuid=>$ftime){ 
      $fline=$fuid.'|'.$ftime."\n"; 
      @fputs($fp,$fline); 
    } 
    flock($fp,LOCK_UN); 
    fclose($fp); 
  } 
} 
echo 'document.write("'.$total_online.'");'; 

I hope this article will help you learn PHP programming.

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