PHP调用谷歌翻译

$longtext = '你好,北京!';

function gtranslate($text,$to='zh-CN'){
    $entext = urlencode($text);
    $url = 'https://translate.google.cn/translate_a/single?client=gtx&dt=t&ie=UTF-8&oe=UTF-8&sl=auto&tl='.$to.'&q='.$entext;
    set_time_limit(0);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_MAXREDIRS,20);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 40);
    curl_setopt($ch, CURLOPT_URL, $url);
    $result = curl_exec($ch);
    curl_close($ch);
    $result = json_decode($result);
    if(!empty($result)){
        foreach($result[0] as $k){
            $v[] = $k[0];
        }
        return implode(" ", $v);
    }
}
echo gtranslate($longtext,'en');