function mt($text, $lang) {

    $url = 'https://www.googleapis.com/language/translate/v2?key=' .  $apiKey . '&q=' . rawurlencode($text) . '&source=en&target=' . $lang;
    $handle = curl_init($url);
    curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false);
    $response = curl_exec($handle);
    $responseDecoded = json_decode($response, JSON_UNESCAPED_UNICODE);
    $responseCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);

    curl_close($handle);

    if($responseCode != 200) {
        $resultxt = 'not200result';
      }
    else {
        $resultxt = $responseDecoded['data']['translations'][0]['translatedText'];
    }
    return $resultxt;
}

<value>&#x3088;&#x3046;&#x3053;&#x305D;&#xFF05;0 ST&#x6570;&#x5B66;</value>

$xml=simplexml_load_file('myfile.xml'); //Load source XML file
$xml->addAttribute('encoding', 'UTF-8');
$xmlFile = 'translation.xml'; //File that will be saved
//Here I have a call to the MT function above and get it to the XML file at face value.
$xml->asXML($xmlFile) //save translated XML file