PHP realizes the number of current users online_PHP tutorial

Principle: Count how many people are currently online based on different IPs.
Implementation method: You can use database or text.
I used text implementation here.
/**
*@ Date 2010.04.07
*@ Author                 China Star bkJia.com
*@ Blog http://hi.baidu.com/woaidelphi/blog
*/
$user_online = "count.php"; //File to save the number of people
touch($user_online);//If this file does not exist, create
$timeout = 30; //If there is no action within 30 seconds, it will be considered offline
$user_arr = file_get_contents($user_online);
$user_arr = explode(#,rtrim($user_arr,#));print_r($user_arr);
$temp = array();
foreach($user_arr as $value){
$user = explode(",",trim($value));
if (($user[0] != getenv(REMOTE_ADDR)) && ($user[1] > time())) {//If it is not the user’s IP and the time has not expired, put it into the array
array_push($temp,$user[0].",".$user[1]);
}
}
array_push($temp,getenv(REMOTE_ADDR).",".(time() + ($timeout)).#); //Save this user's information
$user_arr = implode("#",$temp);
//Write to file
$fp = fopen($user_online,"w");
flock($fp,LOCK_EX); //flock() does not work properly in NFS and other network file systems
fputs($fp,$user_arr);
flock($fp,LOCK_UN);
fclose($fp);
echo "Currently there are".count($temp)."People are online";
?>

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