Php 如何修复错误：套接字\u recv无法从套接字0读取操作已成功完成

我发现了这个使用WebSocket和PHP Socket的简单聊天教程：

它工作正常，但我的CLI出现以下错误：

Warning: socket_recv(); unable to read from socket [0]: The operation completed successfully

我做了我的研究，但在互联网上没有一个明确的答案这个问题。我也试着联系博客作者，但他已经一个月没有回复我的信息了。我是网络套接字新手，请帮助

当用户离开聊天室时会发生此错误

以下是服务器脚本：

$host = 'localhost'; //host
$port = '9000'; //port
$null = NULL; //null var

//Create TCP/IP sream socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//reuseable port
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);

//bind socket to specified host
socket_bind($socket, 0, $port);

//listen to port
socket_listen($socket);

//create & add listning socket to the list
$clients = array($socket);

//start endless loop, so that our script doesn't stop
while (true) {
    //manage multipal connections
    $changed = $clients;
    //returns the socket resources in $changed array
    socket_select($changed, $null, $null, 0, 10);

    //check for new socket
    if (in_array($socket, $changed)) {
        $socket_new = socket_accept($socket); //accpet new socket
        $clients[] = $socket_new; //add socket to client array

        $header = socket_read($socket_new, 1024); //read data sent by the socket
        perform_handshaking($header, $socket_new, $host, $port); //perform websocket handshake

        socket_getpeername($socket_new, $ip); //get ip address of connected socket
        $response = mask(json_encode(
            array(
                'type'      =>  'system', 
                'message'   =>  $ip.' connected'
            )
        )); //prepare json data

        send_message($response); //notify all users about new connection

        //make room for new socket
        $found_socket = array_search($socket, $changed);
        unset($changed[$found_socket]);

    }   


    //loop through all connected sockets
    foreach ($changed as $changed_socket) {

        //check for any incomming data
        while(socket_recv($changed_socket, $buf, 1024, 0) >= 1) {

            $received_text = unmask($buf); //unmask data
            $tst_msg = json_decode($received_text); //json decode 

            $user_name = ''; 
            $user_message = ''; 
            $user_color = '';

            if($tst_msg){
                $user_name = $tst_msg->name;
                $user_message = $tst_msg->message; //message text
                $user_color = $tst_msg->color; //color
            }

            //prepare data to be sent to client
            $response_text = mask(json_encode(
                array(
                    'type'      =>  'usermsg', 
                    'name'      =>  $user_name, 
                    'message'   =>  $user_message, 
                    'color'     =>  $user_color
                )
            ));

            send_message($response_text); //send data
            break 2; //exist this loop
        }       

        $buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
        if ($buf === false) { // check disconnected client

            // remove client for $clients array
            $found_socket = array_search($changed_socket, $clients);
            socket_getpeername($changed_socket, $ip);
            unset($clients[$found_socket]);

            //notify all users about disconnected connection
            $response = mask(json_encode(
                array(
                    'type'      => 'system', 
                    'message'   => $ip . ' disconnected'
                )
            ));
            send_message($response);
        }
    }

}
// close the listening socket
socket_close($sock);

function send_message($msg) {

    global $clients;
    foreach($clients as $changed_socket) {
        @socket_write($changed_socket,$msg,strlen($msg));
    }

    return true;

}


//Unmask incoming framed message
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;
}

//Encode message for transfer to client.
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;
}

//handshake new client.
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')));
    //hand shaking header
    $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));
}

$host='localhost'//主办
$port='9000'//港口
$null=null//空变量
//创建TCP/IP sream套接字
$socket=socket\u create（AF\u INET、SOCK\u STREAM、SOL\u TCP）；
//可重用端口
socket\u set\u选项（$socket，SOL\u socket，SO\u REUSEADDR，1）；
//将套接字绑定到指定的主机
套接字绑定（$socket，0，$port）；
//监听端口
socket\u监听（$socket）；
//创建列表套接字并将其添加到列表中（&D）
$clients=数组（$socket）；
//开始无休止的循环，这样我们的脚本就不会停止
while（true）{
//管理多路径连接
$changed=$clients；
//返回$changed数组中的套接字资源
socket_select（$changed，$null，$null，0,10）；
//检查是否有新插座
if（在数组中（$socket，$changed））{
$socket\u new=socket\u accept（$socket）；//accpet new socket
$clients[]=$socket\u new；//将套接字添加到客户端阵列
$header=socket\u read（$socket\u new，1024）；//读取套接字发送的数据
执行握手（$header，$socket_new，$host，$port）；//执行websocket握手
socket\u getpeername（$socket\u new，$ip）；//获取所连接套接字的ip地址
$response=mask（json_编码(
排列(
'类型'=>'系统'，
'消息'=>$ip。'已连接'
)
))；//准备json数据
发送消息（$response）；//通知所有用户新连接
//为新插座腾出空间
$found\u socket=array\u search（$socket，$changed）；
未设置（$changed[$found\u socket]）；
}   
//通过所有连接的插座进行循环
foreach（$changed as$changed\u socket）{
//检查是否有任何输入数据
而（socket\u recv（$changed\u socket，$buf，1024，0）>=1）{
$received_text=unmask（$buf）；//取消掩码数据
$tst_msg=json_decode（$received_text）；//json decode
$user_name=''；
$user_message=''；
$user_color=''；
如果（$tst\U msg）{
$user\u name=$tst\u msg->name；
$user\u message=$tst\u msg->message；//消息文本
$user\u color=$tst\u msg->color；//color
}
//准备要发送给客户机的数据
$response\u text=mask（json\u编码(
排列(
'type'=>'usermsg'，
“name”=>$user\u name，
'消息'=>$user\u消息，
“颜色”=>$user\u颜色
)
));
发送消息（$response_text）；//发送数据
中断2；//存在此循环
}       
$buf=@socket\u read（$changed\u socket，1024，PHP\u NORMAL\u read）；
如果（$buf==false）{//检查断开连接的客户端
//删除$clients阵列的客户端
$found\u socket=array\u search（$changed\u socket，$clients）；
socket\u getpeername（$changed\u socket，$ip）；
未设置（$clients[$found_socket]）；
//通知所有用户已断开连接
$response=mask（json_编码(
排列(
'类型'=>'系统'，
'消息'=>$ip。'已断开连接'
)
));
发送消息（$response）；
}
}
}
//关闭监听插座
插座关闭（$sock）；
函数send_message（$msg）{
全球美元客户；
foreach（$clients as$changed\u socket）{
@socket_write（$changed_socket，$msg，strlen（$msg））；
}
返回true；
}
//取消对传入帧消息的掩码
函数取消掩码（$text）{
$length=ord（$text[1]）&127；
如果（$length==126）{
$masks=substr（$text，4，4）；
$data=substr（$text，8）；
}
elseif（$length==127）{
$masks=substr（$text，10，4）；
$data=substr（$text，14）；
}
否则{
$masks=substr（$text，2，4）；
$data=substr（$text，6）；
}
$text=”“；
对于（$i=0；$i=65536）
$header=pack（'CCNN'，$b1127，$length）；
返回$header.$text；
}
//与新客户握手。
函数执行握手（$recved_header、$client_conn、$host、$port）{
$headers=array（）；
$lines=preg\u split（“/\r\n/”，$receved\u头）；
foreach（$line作为$line）{
$line=印章（$line）；
if（preg_match（'/\A（\S+）：（.*）\z/'，$line，$matches））{
$headers[$matches[1]]=$matches[2]；
}
}
$secKey=$headers['Sec-WebSocket-Key']；
$secAccept=base64_编码（包（'H*'，sha1（$secKey.'258EAFA5-E914-47DA-95CA-C5AB0DC85B11'））；
//手摇式割台
$upgrade=“HTTP/1.1 101 Web套接字协议握手\r\n”。
“升级：websocket\r\n”。
“连接：升级\r\n”。
“WebSocket来源：$host\r\n”。
“WebSocket位置：ws://$host:$port/demo/shout.php\r\n”。
“Sec WebSocket Accept:$secAccept\r\n\r\n”；
socket_write（$client_conn，$upgrade，strlen（$upgrade））；
}

以下是客户端脚本：

<!DOCTYPE html>
<html>
<head>
<meta charset='UTF-8' />
<style type="text/css">
<!--
.chat_wrapper {
    width: 500px;
    margin-right: auto;
    margin-left: auto;
    background: #CCCCCC;
    border: 1px solid #999999;
    padding: 10px;
    font: 12px 'lucida grande',tahoma,verdana,arial,sans-serif;
}
.chat_wrapper .message_box {
    background: #FFFFFF;
    height: 150px;
    overflow: auto;
    padding: 10px;
    border: 1px solid #999999;
}
.chat_wrapper .panel input{
    padding: 2px 2px 2px 5px;
}
.system_msg{color: #BDBDBD;font-style: italic;}
.user_name{font-weight:bold;}
.user_message{color: #88B6E0;}
-->
</style>
</head>
<body>  
<?php 
$colours = array('007AFF','FF7000','FF7000','15E25F','CFC700','CFC700','CF1100','CF00BE','F00');
$user_colour = array_rand($colours);
?>

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>

<script language="javascript" type="text/javascript">  
$(document).ready(function(){
    //create a new WebSocket object.
    var wsUri = "ws://localhost:9000/websockets/server.php";    
    websocket = new WebSocket(wsUri); 

    websocket.onopen = function(ev) { // connection is open 
        $('#message_box').append("<div class=\"system_msg\">Connected!</div>"); //notify user
    }

    $('#send-btn').click(function(){ //use clicks message send button   
        var mymessage = $('#message').val(); //get message text
        var myname = $('#name').val(); //get user name

        if(myname == ""){ //empty name?
            alert("Enter your Name please!");
            return;
        }
        if(mymessage == ""){ //emtpy message?
            alert("Enter Some message Please!");
            return;
        }

        //prepare json data
        var msg = {
            message: mymessage,
            name: myname,
            color : '<?php echo $colours[$user_colour]; ?>'
        };
        //convert and send data to server
        websocket.send(JSON.stringify(msg));
    });

    //#### Message received from server?
    websocket.onmessage = function(ev) {

        var msg = JSON.parse(ev.data); //PHP sends Json data
        var type = msg.type; //message type
        var umsg = msg.message; //message text
        var uname = msg.name; //user name
        var ucolor = msg.color; //color

        if(type == 'usermsg' && uname){
            $('#message_box').append("<div><span class=\"user_name\" style=\"color:#"+ucolor+"\">"+uname+"</span> : <span class=\"user_message\">"+umsg+"</span></div>");       
        }

        if(type == 'system'){
            $('#message_box').append("<div class=\"system_msg\">"+umsg+"</div>");       
        }

        $('#message').val(''); //reset text
    };

    websocket.onerror = function(ev){
        $('#message_box').append("<div class=\"system_error\">Error Occurred - "+ev.data+"</div>");
    };
    websocket.onclose = function(ev){
        $('#message_box').append("<div class=\"system_msg\">Connection Closed</div>");
    };

});
</script>
<div class="chat_wrapper">
<div class="message_box" id="message_box"></div>
<div class="panel">
<input type="text" name="name" id="name" placeholder="Your Name" maxlength="10" style="width:20%"  />
<input type="text" name="message" id="message" placeholder="Message" maxlength="80" style="width:60%" />
<button id="send-btn">Send</button>
</div>
</div>

</body>
</html>

$（文档）.ready（函数（）{
//创建新的WebSocket对象。
var wsUri=“ws://localhost:9000/websockets/server.php”；
websocket=新的websocket（wsUri）；
websocket.onopen=
//loop through all connected sockets
foreach ($changed as $changed_socket) {

    //check for any incomming data
    while(socket_recv($changed_socket, $buf, 1024, 0) >= 1) {....

//loop through all connected sockets
foreach ($changed as $changed_socket) {

    //check for any incomming data
    $bytesocket=@socket_recv($changed_socket, $buf, 1024, 0);
    while($bytesocket >= 1) {......