使用 Google Analytics 在网站上显示实时用户数

(您需要为当前文件夹设置 777 chmod，以便自动创建 users.dat)

<?php
$current_users_file = 'users.txt';
if (!file_exists($current_users_file)) fclose(fopen($current_users_file, "w"));
$users = file($current_users_file);
$found = false;
$user_count = count($users);
$fp = fopen($current_users_file, "w");
foreach($users as $user) {
    $user = explode("|", $user);
    if ($user[1]+300 < time()) {
        $user_count--;
        continue;
    } elseif ($user[0] == $REMOTE_ADDR) {
        $user[1] = time();
        $found = true;
    }
    $user = trim(implode("|", $user))."
";
    fputs($fp, $user);
}
if (!$found) {
    fputs($fp, $REMOTE_ADDR."|".time()."
");
    $user_count++;
}
fclose($fp);
echo 'Active users <b>' . $user_count . '</b>';
?>

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