如何通过PHP百度翻译API实现葡萄牙语到日语的互译功能？

<?php
require_once('vendor/autoload.php');
use StichozaGoogleTranslateTranslateClient;

define('API_KEY', 'YOUR_API_KEY');
define('SECRET_KEY', 'YOUR_SECRET_KEY');

function translate($text, $from, $to) {
    $appId = API_KEY;
    $appSecret = SECRET_KEY;
    $httpClient = new GuzzleHttpClient();

    // 获取API Token
    $response = $httpClient->get('https://openapi.baidu.com/oauth/2.0/token', [
        'query' => [
            'grant_type' => 'client_credentials',
            'client_id' => $appId,
            'client_secret' => $appSecret,
        ],
    ]);

    $result = json_decode((string) $response->getBody(), true);

    $accessToken = $result['access_token'];

    // 翻译文本
    $response = $httpClient->get('https://fanyi-api.baidu.com/api/trans/vip/translate', [
        'query' => [
            'q' => $text,
            'from' => $from,
            'to' => $to,
            'appid' => $appId,
            'salt' => rand(10000,99999),
            'sign' => md5($appId . $text . rand(10000,99999) . $appSecret),
        ],
        'headers' => [
            'Content-Type' => 'application/x-www-form-urlencoded',
        ],
    ]);

    $result = json_decode((string) $response->getBody(), true);

    return $result['trans_result'][0]['dst'];
}

$text = "Olá, mundo!";  //需要翻译的葡萄牙语文本
$translated_text = translate($text, 'pt', 'jp');  //将葡萄牙语翻译为日语

echo "翻译结果: " . $translated_text;

php translation.php

翻译结果: こんにちは、世界！