Người dùng online trong 30 phút cuối

<?php

$dataFile = "visitors.txt";

$sessionTime = 30; //this is the time in **minutes** to consider someone online before removing them from our file

//Please do not edit bellow this line

error_reporting(E_ERROR | E_PARSE);

if(!file_exists($dataFile)) {

$fp = fopen($dataFile, "w+");

fclose($fp);

}

$ip = $_SERVER['REMOTE_ADDR'];

$users = array();

$onusers = array();

//getting

$fp = fopen($dataFile, "r");

flock($fp, LOCK_SH);

while(!feof($fp)) {

$users[] = rtrim(fgets($fp, 32));

}

flock($fp, LOCK_UN);

fclose($fp);

//cleaning

$x = 0;

$alreadyIn = FALSE;

foreach($users as $key => $data) {

list( , $lastvisit) = explode("|", $data);

if(time() - $lastvisit >= $sessionTime * 60) {

$users[$x] = "";

} else {

if(strpos($data, $ip) !== FALSE) {

$alreadyIn = TRUE;

$users[$x] = "$ip|" . time(); //updating

}

}

$x++;

}

if($alreadyIn == FALSE) {

$users[] = "$ip|" . time();

}

//writing

$fp = fopen($dataFile, "w+");

flock($fp, LOCK_EX);

$i = 0;

foreach($users as $single) {

if($single != "") {

fwrite($fp, $single . "\r

");

$i++;

}

}

flock($fp, LOCK_UN);

fclose($fp);

if($uo_keepquiet != TRUE) {

echo '<div style="padding:5px; margin:auto; background-color:#fff"><b>' . $i . ' online in last 30 minutes</b></div>';

}

?>