>[info] 理解stream系列函数 * **stream\_socket\_server**：创建一个服务端socket 手册地址： https://php.golaravel.com/function.stream-socket-server.html * **stream\_socket\_accept**：这个函数才是真正的建立连接 手册地址： https://php.golaravel.com/function.stream-sockete-accept.html * **stream\_socket\_client**：客户端连接服务端 手册地址： https://php.golaravel.com/function.stream-socket-client.html * **fread**：读取socket资源文件信息 手册地址： https://php.golaravel.com/function.fread.html * **fwrite**：写入socket资源文件信息 手册地址： https://php.golaravel.com/function.fwrite.html  >[info] 使用stream函数代码测试 * **服务端代码** ~~~ <?php echo swoole_get_local_ip()['ens33'] . ':9501' . PHP_EOL; $socket = stream_socket_server("tcp://0.0.0.0:9501", $errno, $errstr); if (!$socket) { echo "$errstr ($errno)<br />\n"; } else { while ($conn = stream_socket_accept($socket)) { fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n"); fclose($conn); } fclose($socket); } ?> ~~~ * **客户端代码** ~~~ <?php $fp = stream_socket_client("tcp://" . swoole_get_local_ip()['ens33'] . ":9501", $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n"); while (!feof($fp)) { echo fgets($fp, 1024); } fclose($fp); } ?> ~~~ * **运行效果** 1. 服务端开启监听  2. 客户端连接获取结果  >[info] 使用stream 客户端 连接 tcp 服务端 * **服务端代码** ~~~ <?php echo swoole_get_local_ip()['ens33'] . ':9501' . PHP_EOL; $socket = stream_socket_server("tcp://0.0.0.0:9501", $errno, $errstr); if (!$socket) { echo "$errstr ($errno)<br />\n"; } else { while ($conn = stream_socket_accept($socket)) { fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n"); fclose($conn); } fclose($socket); } ?> ~~~ * **客户端代码** ~~~ <?php $client = new Swoole\Client(SWOOLE_SOCK_TCP); if (!$client->connect(swoole_get_local_ip()['ens33'], 9501, -1)) { exit("connect failed. Error: {$client->errCode}\n"); } $client->send("hello world\n"); echo $client->recv(); $client->close(); ~~~ * **运行效果** 1. 服务端开启监听  2. 客户端连接获取结果  >[info] 使用ctp客户端 连接 stream 服务端 * **服务端代码** ~~~ <?php echo swoole_get_local_ip()['ens33'] . ':9501' . PHP_EOL; $server = new Swoole\Server("0.0.0.0", 9501); $server->on('connect', function ($server, $fd){ echo "connection open: {$fd}\n"; }); $server->on('receive', function ($server, $fd, $reactor_id, $data) { $server->send($fd, "Swoole: {$data}"); $server->close($fd); }); $server->on('close', function ($server, $fd) { echo "connection close: {$fd}\n"; }); $server->start(); ~~~ * **客户端代码** ~~~ <?php $fp = stream_socket_client("tcp://" . swoole_get_local_ip()['ens33'] . ":9501", $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n"); while (!feof($fp)) { echo fgets($fp, 1024); } fclose($fp); } ?> ~~~ * **运行效果** 1. 服务端开启监听  2. 客户端连接获取结果  >[danger] **由此可见**：只要协议相同，客户端 或 服务端 可以是其他物理机 或其他 c++ java python go 等。