This article brings you how to build and test a Socket server under PHP? (code), it has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Ideas for building a socket server

1) Purpose: Understand the working mechanism of the socket server

2) Idea: Create a socket -> Add the socket to the connection pool -> Process the received information -> Handshake action -> Send the information

2, socket server code

Note: Copy to php file, it can be run directly from the command line, no other support is required

Special note: json_encode() is done in order to be able to transmit Chinese _sendMsg

master = $this->_connect($address, $port); $this->sockets[] = $this->master; //运行socket while (true) { $sockets = $this->sockets; $write = NULL; $except = NULL; socket_select($sockets, $write, $except, NULL); //$write,$except传引用 foreach ($sockets as $socket) { if ($socket == $this->master) { $client = socket_accept($socket); $this->handshake = false; if ($client) { $this->sockets[] = $client; //加入连接池 } } else { //接收信息 $bytes = @socket_recv($socket, $buffer, 2048, 0); if ($bytes <= 6) { $this->_disConnect($socket); continue; }; //处理信息 if (!$this->handshake) { $this->_handshake($socket, $buffer); } else { $buffer = $this->_decode($buffer); $this->_sendMsg($buffer, $socket); } } } } } /** * 创建socket连接 * @param $address * @param $port * @return resource */ private function _connect($address, $port) { //创建socket $master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"); socket_bind($master, $address, $port) or die("socket_bind() failed: reason: " . socket_strerror(socket_last_error($master)) . "\n"); socket_listen($master, 5) or die("socket_listen() failed: reason: " . socket_strerror(socket_last_error($master)) . "\n"); return $master; } /** * 握手动作 * @param $socket * @param $buffer */ private function _handshake($socket, $buffer) { //握手动作信息 $buf = substr($buffer, strpos($buffer, 'Sec-WebSocket-Key:') + 18); $key = trim(substr($buf, 0, strpos($buf, "\r\n"))); $new_key = base64_encode(sha1($key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true)); $new_message = "HTTP/1.1 101 Switching Protocols\r\n"; $new_message .= "Upgrade: websocket\r\n"; $new_message .= "Sec-WebSocket-Version: 13\r\n"; $new_message .= "Connection: Upgrade\r\n"; $new_message .= "Sec-WebSocket-Accept: " . $new_key . "\r\n\r\n"; //记录握手动作 socket_write($socket, $new_message, strlen($new_message)); $this->handshake = true; } /** * 断开socket连接 * @param $socket */ private function _disConnect($socket) { $index = array_search($socket, $this->sockets); socket_close($socket); if ($index >= 0) { array_splice($this->sockets, $index, 1); } } /** * 发送信息 * @param $buffer * @param $client */ private function _sendMsg($buffer, $client) { $send_buffer = $this->_frame(json_encode($buffer)); foreach ($this->sockets as $socket) { if ($socket != $this->master && $socket != $client) { //广播发送（除了自己） socket_write($socket, $send_buffer, strlen($send_buffer)); } } } /** * 解析数据帧 * @param $buffer * @return null|string */ private function _decode($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; } /** * 处理返回帧 * @param $buffer * @return string */ private function _frame($buffer) { $len = strlen($buffer); if ($len <= 125) { return "\x81" . chr($len) . $buffer; } else if ($len <= 65535) { return "\x81" . chr(126) . pack("n", $len) . $buffer; } else { return "\x81" . char(127) . pack("xxxxN", $len) . $buffer; } } } $sc = new SocketServer(); $sc->run('127.0.0.1', 2046);

3. Client code

Note: Copy it directly to html and put it in the same folder as the above php file. Pay special attention to the two layers of onmessage parsing. parse

      
  
WebSocket Test
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4. Test example

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