php socket乱码

<?php
$host = '127.0.0.1';
$port = 12345;

// 创建 socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (!$socket) {
    echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
    exit();
}

// 绑定 socket 到地址和端口
$result = socket_bind($socket, $host, $port);
if (!$result) {
    echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($socket)) . "\n";
    exit();
}

// 监听连接
$result = socket_listen($socket, 3);
if (!$result) {
    echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($socket)) . "\n";
    exit();
}

echo "Server listening on $host:$port...\n";

while (true) {
    // 接受连接
    $client = socket_accept($socket);
    if (!$client) {
        echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($socket)) . "\n";
        continue;
    }

    // 读取客户端发送的数据
    $data = socket_read($client, 1024);
    if ($data === false) {
        echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($client)) . "\n";
        socket_close($client);
        continue;
    }

    // 假设客户端发送的数据是 UTF-8 编码的
    $decoded_data = mb_convert_encoding($data, 'UTF-8', 'auto');

    echo "Received message: $decoded_data\n";

    // 发送响应数据（假设响应数据也是 UTF-8 编码）
    $response = "Hello from server!";
    socket_write($client, $response, strlen($response));

    // 关闭连接
    socket_close($client);
}

// 关闭 socket
socket_close($socket);
?>

<?php
$host = '127.0.0.1';
$port = 12345;

// 创建 socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (!$socket) {
    echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
    exit();
}

// 连接到服务器
$result = socket_connect($socket, $host, $port);
if (!$result) {
    echo "socket_connect() failed: reason: " . socket_strerror(socket_last_error($socket)) . "\n";
    exit();
}

// 发送数据（假设数据是 UTF-8 编码）
$message = "Hello from client!";
socket_write($socket, $message, strlen($message));

// 读取响应数据
$response = socket_read($socket, 1024);
if ($response === false) {
    echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($socket)) . "\n";
} else {
    // 假设响应数据是 UTF-8 编码
    $decoded_response = mb_convert_encoding($response, 'UTF-8', 'auto');
    echo "Received response: $decoded_response\n";
}

// 关闭连接
socket_close($socket);
?>