How does workerman count the number of people online?

<?php
use Workerman\Worker;
use Workerman\Lib\Timer;
require_once __DIR__ . &#39;/Workerman/Autoloader.php&#39;;

$worker = new Worker(&#39;websocket://127.0.0.1:2345&#39;);
// 全局变量，保存当前进程的客户端连接数
$connection_count = 0;

// 这个例子中进程数必须为1
$worker->count = 1;
$worker->onConnect = function($connection)
{
    // 有新的客户端连接时，连接数+1
    global $connection_count;
    
    ++$connection_count;
    echo "now connection_count=$connection_count\n";
};
// 进程启动时设置一个定时器，定时向所有客户端连接发送数据
$worker->onWorkerStart = function($worker)
{
    // 定时，每10秒一次
    Timer::add(1, function()use($worker)
    {
        global $connection_count;
        // 遍历当前进程所有的客户端连接，发送当前服务器的时间
        foreach($worker->connections as $connection)
        {
            $connection->send($connection_count);
        }
    });
};
$worker->onClose = function($connection)
{
    // 客户端关闭时，连接数-1
    global $connection_count;
    $connection_count--;
    echo "now connection_count=$connection_count\n";
};
// 运行worker
Worker::runAll();

<?php

?>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
 function ds(){
		$.get(&#39;127.0.0.1:2345&#39;,function(data,status){
			console.log("Data: " + data + "nStatus: " + status);
			})
	 }
// window.setInterval(ds,1000);

ws = new WebSocket("ws://127.0.0.1:2345");
ws.onopen = function() {
    //alert("连接成功");
    //ws.send(&#39;tom&#39;);
    //alert("给服务端发送一个字符串：tom");
};
ws.onmessage = function(e) {
    //alert("收到服务端的消息：" + e.data);
    console.log("收到服务端的消息：" + e.data);
};

</script>