PHP的google翻译为什么在火车头采集器里面没反应呢？

想用来作为火车头采集器的翻译插件，但是用不起来。
以下这段代码来自这里

请懂火车头采集器的朋友出手帮忙哈！

<?php
function translate($text){
    $query = urlencode($text);
    //$url = 'https://translate.google.cn/translate_a/single?client=gtx&dt=t&ie=UTF-8&oe=UTF-8&sl='.FROM.'&tl='.TO.'&q='.$query;    这是作者的版本，我看google的接口方式变了，就改成下面这样了，其他没改一个代码～
    $url = 'https://translate.google.cn/?sl='.FROM.'&tl='.TO.'&client=gtx&dt=t&ie=UTF-8&oe=UTF-8&op=translate&text='.$query;
    set_time_limit(0);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_REFERER, "https://translate.google.cn" );
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36' );
    curl_setopt($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);
    }
}

//以下是关于火车头采集器的相关设置
if($LabelArray['PageType']=="Save")
{
    $direction = explode('>' , $LabelArray['翻译方向']);
    define("FROM",$direction[0]);
    define("TO",$direction[1]);
    $tab = explode(',' , $LabelArray['翻译标签']);
    foreach($tab as $t_value){
        $arr[] = explode('>' , $t_value);
    }
    $arrlength=count($arr);
    for($x=0;$x<$arrlength;$x++){
        $LabelArray[''.$arr[$x][1].''] = translate($LabelArray[''.$arr[$x][0].'']);
    }
}
echo serialize($LabelArray);
?>

这个谷歌翻译接口是有频率限制的