如何解码谷歌翻译响应与PHP？

function googleTranslate($text, $targetLanguage, $apiKey) {
    $url = "https://translation.googleapis.com/language/translate/v2?key={$apiKey}";
    $data = [
        'q' => $text,
        'target' => $targetLanguage,
    ];
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $response = curl_exec($ch);
    curl_close($ch);
    return json_decode($response, true);
}

$text = "Hello, world!";
$targetLanguage = "zh-CN";
$apiKey = "YOUR_API_KEY";
$result = googleTranslate($text, $targetLanguage, $apiKey);
echo $result['data']['translations'][0]['translatedText']; // 输出 "你好，世界！"