websocket 簡易聊天

//通過命令行執行php文件如 php -q index.php
// php -S localhost:8000 瀏覽器訪問index.html

//index.html
<!DOCTYPE html>
<html>
    <head>
        <title>chatdemo</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width,initial-scale=1, maximum-scale=1, user-scalable=no">
        <link href="https://cdn.bootcss.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
        <style type="text/css">
        <!--
        html, body {
          min-height: 100%; }

        body {
          margin: 0;
          padding: 0;
          width: 100%;
          font-family: "Microsoft Yahei",sans-serif, Arial; }

        .container {
          text-align: center; }

        .title {
          font-size: 16px;
          color: rgba(0, 0, 0, 0.3);
          position: fixed;
          line-height: 30px;
          height: 30px;
          left: 0px;
          right: 0px;
          background-color: white; }

        .content {
          background-color: #f1f1f1;
          border-top-left-radius: 6px;
          border-top-right-radius: 6px;
          margin-top: 30px; }
          .content .show-area {
            text-align: left;
            padding-top: 8px;
            padding-bottom: 168px; }
            .content .show-area .message {
              width: 70%;
              padding: 5px;
              word-wrap: break-word;
              word-break: normal; }
          .content .write-area {
            position: fixed;
            bottom: 0px;
            right: 0px;
            left: 0px;
            background-color: #f1f1f1;
            z-index: 10;
            width: 100%;
            height: 160px;
            border-top: 1px solid #d8d8d8; }
            .content .write-area .send {
              position: relative;
              top: -28px;
              height: 28px;
              border-top-left-radius: 55px;
              border-top-right-radius: 55px; }
            .content .write-area #name{
              position: relative;
              top: -20px;
              line-height: 28px;
              font-size: 13px; }
        -->
        </style>
    </head>
    <body>
        <div class="container">
            <div class="title">簡易聊天demo</div>
            <div class="content">
                <div class="show-area"></div>
                <div class="write-area">
                    <div><button class="btn btn-default send" >發送</button></div>
                    <div><input name="name" id="name" type="text" placeholder="input your name"></div>
                    <div>
                        <textarea name="message" id="message" cols="38" rows="4" placeholder="input your message..."></textarea>
                    </div>                    
                </div>
            </div>
        </div>

        <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
        <script src="https://cdn.bootcss.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
        <script>
        $(function(){
            var wsurl = 'ws://127.0.0.1:9505/index.php';
            var websocket;
            var i = 0;
            if(window.WebSocket){
                websocket = new WebSocket(wsurl);

                //連接建立
                websocket.onopen = function(evevt){
                    console.log("Connected to WebSocket server.");
                    $('.show-area').append('<p class="bg-info message"><i class="glyphicon glyphicon-info-sign"></i>Connected to WebSocket server!</p>');
                }
                //收到消息
                websocket.onmessage = function(event) {
                    var msg = JSON.parse(event.data); //解析收到的json消息數據

                    var type = msg.type; // 消息類型
                    var umsg = msg.message; //消息文本
                    var uname = msg.name; //發送人
                    i++;
                    if(type == 'usermsg'){
                        $('.show-area').append('<p class="bg-success message"><i class="glyphicon glyphicon-user"></i><a name="'+i+'"></a><span class="label label-primary">'+uname+' say: </span>'+umsg+'</p>');
                    }
                    if(type == 'system'){
                        $('.show-area').append('<p class="bg-warning message"><a name="'+i+'"></a><i class="glyphicon glyphicon-info-sign"></i>'+umsg+'</p>');
                    }

                    $('#message').val(''); 
                    window.location.hash = '#'+i;
                }

                //發生錯誤
                websocket.onerror = function(event){
                    i++;
                    console.log("Connected to WebSocket server error");
                    $('.show-area').append('<p class="bg-danger message"><a name="'+i+'"></a><i class="glyphicon glyphicon-info-sign"></i>Connect to WebSocket server error.</p>');
                    window.location.hash = '#'+i;
                }

                //連接關閉
                websocket.onclose = function(event){
                    i++;
                    console.log('websocket Connection Closed. ');
                    $('.show-area').append('<p class="bg-warning message"><a name="'+i+'"></a><i class="glyphicon glyphicon-info-sign"></i>websocket Connection Closed.</p>');
                    window.location.hash = '#'+i;
                }

                function send(){
                    var name = $('#name').val();
                    var message = $('#message').val();
                    if(!name){
                        alert('請輸入用戶名!');
                        return false;
                    }
                    if(!message){
                        alert('發送消息不能爲空!');
                        return false;
                    }
                    var msg = {
                        message: message,
                        name: name
                    };
                    try{  
                        websocket.send(JSON.stringify(msg)); 
                    } catch(ex) {  
                        console.log(ex);
                    }  
                }

                //按下enter鍵發送消息
                $(window).keydown(function(event){
                    if(event.keyCode == 13){
                        console.log('user enter');
                        send();
                    }
                });

                //點發送按鈕發送消息
                $('.send').bind('click',function(){
                    send();
                });

            }
            else{
                alert('該瀏覽器不支持web socket');
            }

        });    
        </script>        
    </body>
</html>

//服務端 index.php
<?php
$host = '127.0.0.1'; 
$port = '9505'; 
$null = NULL; 

//創建tcp socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($socket, 0, $port);

//監聽端口
socket_listen($socket);

//連接的client socket 列表
$clients = array($socket);

//設置一個死循環,用來監聽連接 ,狀態
while (true) {

    $changed = $clients;
    socket_select($changed, $null, $null, 0, 10);

    //如果有新的連接
    if (in_array($socket, $changed)) {
        //接受並加入新的socket連接
        $socket_new = socket_accept($socket); 
        $clients[] = $socket_new;

        //通過socket獲取數據執行handshake
        $header = socket_read($socket_new, 1024); 
        perform_handshaking($header, $socket_new, $host, $port);

        //獲取client ip 編碼json數據,併發送通知
        socket_getpeername($socket_new, $ip);
        $response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' connected')));
        send_message($response);
        $found_socket = array_search($socket, $changed);
        unset($changed[$found_socket]);
    }

    //輪詢 每個client socket 連接
    foreach ($changed as $changed_socket) {    

        //如果有client數據發送過來
        while(socket_recv($changed_socket, $buf, 1024, 0) >= 1)
        {
            //解碼發送過來的數據
            $received_text = unmask($buf); 
            $tst_msg = json_decode($received_text);  
            $user_name = $tst_msg->name; 
            $user_message = $tst_msg->message; 

            //把消息發送回所有連接的 client 上去
            $response_text = mask(json_encode(array('type'=>'usermsg', 'name'=>$user_name, 'message'=>$user_message)));
            send_message($response_text);
            break 2; 
        }

        //檢查offline的client
        $buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
        if ($buf === false) { 
            $found_socket = array_search($changed_socket, $clients);
            socket_getpeername($changed_socket, $ip);
            unset($clients[$found_socket]);
            $response = mask(json_encode(array('type'=>'system', 'message'=>$ip.' disconnected')));
            send_message($response);
        }
    }
}
// 關閉監聽的socket
socket_close($sock);

//發送消息的方法
function send_message($msg)
{
    global $clients;
    foreach($clients as $changed_socket)
    {
        @socket_write($changed_socket,$msg,strlen($msg));
    }
    return true;
}


//解碼數據
function unmask($text) {
    $length = ord($text[1]) & 127;
    if($length == 126) {
        $masks = substr($text, 4, 4);
        $data = substr($text, 8);
    }
    elseif($length == 127) {
        $masks = substr($text, 10, 4);
        $data = substr($text, 14);
    }
    else {
        $masks = substr($text, 2, 4);
        $data = substr($text, 6);
    }
    $text = "";
    for ($i = 0; $i < strlen($data); ++$i) {
        $text .= $data[$i] ^ $masks[$i%4];
    }
    return $text;
}

//編碼數據
function mask($text)
{
    $b1 = 0x80 | (0x1 & 0x0f);
    $length = strlen($text);

    if($length <= 125)
        $header = pack('CC', $b1, $length);
    elseif($length > 125 && $length < 65536)
        $header = pack('CCn', $b1, 126, $length);
    elseif($length >= 65536)
        $header = pack('CCNN', $b1, 127, $length);
    return $header.$text;
}

//握手的邏輯
function perform_handshaking($receved_header,$client_conn, $host, $port)
{
    $headers = array();
    $lines = preg_split("/\r\n/", $receved_header);
    foreach($lines as $line)
    {
        $line = chop($line);
        if(preg_match('/\A(\S+): (.*)\z/', $line, $matches))
        {
            $headers[$matches[1]] = $matches[2];
        }
    }

    $secKey = $headers['Sec-WebSocket-Key'];
    $secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
    $upgrade  = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
    "Upgrade: websocket\r\n" .
    "Connection: Upgrade\r\n" .
    "WebSocket-Origin: $host\r\n" .
    "WebSocket-Location: ws://$host:$port/demo/shout.php\r\n".
    "Sec-WebSocket-Accept:$secAccept\r\n\r\n";
    socket_write($client_conn,$upgrade,strlen($upgrade));
}

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