PHP 实现 WebSocket 协议原理与应用详解_php技巧_

address = $address; } if(!empty($port)) { $this->port = $port; } } public function service(){ //获取tcp协议号码。 $tcp = getprotobyname("tcp"); $sock = socket_create(AF_INET, SOCK_STREAM, $tcp); socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1); if($sock < 0) { throw new Exception("failed to create socket: ".socket_strerror($sock)."\n"); } socket_bind($sock, $this->address, $this->port); socket_listen($sock, $this->port); echo "listen on $this->address $this->port ... \n"; $this->_sockets = $sock; } public function run(){ $this->service(); $clients[] = $this->_sockets; while (true){ $changes = $clients; $write = NULL; $except = NULL; socket_select($changes, $write, $except, NULL); foreach ($changes as $key => $_sock){ if($this->_sockets == $_sock){ //判断是不是新接入的socket if(($newClient = socket_accept($_sock)) === false){ die('failed to accept socket: '.socket_strerror($_sock)."\n"); } $line = trim(socket_read($newClient, 1024)); $this->handshaking($newClient, $line); //获取client ip socket_getpeername ($newClient, $ip); $clients[$ip] = $newClient; echo "Client ip:{$ip} \n"; echo "Client msg:{$line} \n"; } else { socket_recv($_sock, $buffer, 2048, 0); $msg = $this->message($buffer); //在这里业务代码 echo "{$key} clinet msg:",$msg,"\n"; fwrite(STDOUT, 'Please input a argument:'); $response = trim(fgets(STDIN)); $this->send($_sock, $response); echo "{$key} response to Client:".$response,"\n"; } } } } /** * 握手处理 * @param $newClient socket * @return int 接收到的信息 */ public function handshaking($newClient, $line){ $headers = array(); $lines = preg_split("/\r\n/", $line); foreach($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: $this->address\r\n" . "WebSocket-Location: ws://$this->address:$this->port/websocket/websocket\r\n". "Sec-WebSocket-Accept:$secAccept\r\n\r\n"; return socket_write($newClient, $upgrade, strlen($upgrade)); } /** * 解析接收数据 * @param $buffer * @return null|string */ public function message($buffer){ $len = $masks = $data = $decoded = null; $len = ord($buffer[1]) & 127; if ($len === 126) { $masks = substr($buffer, 4, 4); $data = substr($buffer, 8); } else if ($len === 127) { $masks = substr($buffer, 10, 4); $data = substr($buffer, 14); } else { $masks = substr($buffer, 2, 4); $data = substr($buffer, 6); } for ($index = 0; $index < strlen($data); $index++) { $decoded .= $data[$index] ^ $masks[$index % 4]; } return $decoded; } /** * 发送数据 * @param $newClinet 新接入的socket * @param $msg 要发送的数据 * @return int|string */ public function send($newClinet, $msg){ $msg = $this->frame($msg); socket_write($newClinet, $msg, strlen($msg)); } public function frame($s) { $a = str_split($s, 125); if (count($a) == 1) { return "\x81" . chr(strlen($a[0])) . $a[0]; } $ns = ""; foreach ($a as $o) { $ns .= "\x81" . chr(strlen($o)) . $o; } return $ns; } /** * 关闭socket */ public function close(){ return socket_close($this->_sockets); } } $sock = new SocketService(); $sock->run();