PHP Google Translation API Multiple Text Strings In One POST Request

According to google and Sitepoint, there are possibilities to translate multiple text strings in one request. However when I tried to translate multiple strings, it resulted in replacing the first string by the last one.

    $handle = curl_init();

    if (FALSE === $handle)
       throw new Exception('failed to initialize');

curl_setopt($handle, CURLOPT_URL,'https://www.googleapis.com/language/translate/v2');
curl_setopt($handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($handle, CURLOPT_POSTFIELDS, array('key'=> $apiKey, 'q' => $heading, 'q' => $content, 'source' => $sl, 'target' => $hl));
curl_setopt($handle,CURLOPT_HTTPHEADER,array('X-HTTP-Method-Override: GET'));
$response = curl_exec($handle);
$responseDecoded = json_decode($response, true);
$responseCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
if($responseCode != 200) {
    header("HTTP/1.0 404 Not Found");
    include_once("ErrorDocument/404.html");
    exit();
}else{
    $heading = $responseDecoded['data']['translations'][0]['translatedText'];
    $content = $responseDecoded['data']['translations'][1]['translatedText'];
}

Any ideas?

    $handle = curl_init();

if (FALSE === $handle)
   throw new Exception('failed to initialize');

curl_setopt($handle, CURLOPT_URL,'https://www.googleapis.com/language/translate/v2');
curl_setopt($handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false);
$data = array('key' => $apiKey,
                'q' => array($heading,$content),
                'source' => $sl,
                'target' => $hl);
curl_setopt($handle, CURLOPT_POSTFIELDS, preg_replace('/%5B(?:[0-9]|[1-9][0-9]+)%5D=/', '=', http_build_query($data)));
curl_setopt($handle,CURLOPT_HTTPHEADER,array('X-HTTP-Method-Override: GET'));
$response = curl_exec($handle);
$responseDecoded = json_decode($response, true);
$responseCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
if($responseCode != 200) {
    header("HTTP/1.0 404 Not Found");
    include_once("ErrorDocument/404.html");
    echo 'Fetching translation failed! Server response code:' . $responseCode . '<br>';
    echo 'Error description: ' . $responseDecoded['error']['errors'][0]['message'] . '<br>';
    echo 'Please contact website administrator';
    exit();
}else{
    $heading = $responseDecoded['data']['translations'][0]['translatedText'];
    $content = $responseDecoded['data']['translations'][1]['translatedText'];
}

This works well for me. Found solution out there. Hope this will help anyone in the future.