function vkApi_getserver($api_key) {
  $curl = curl_init('https://api.vk.com/method/appWidgets.getGroupImageUploadServer');
  curl_setopt($curl, CURLOPT_POST, true);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_POSTFIELDS, array('image_type' => '510x128', 'access_token' => $api_key, 'v' => '5.68'));
  $json = curl_exec($curl);
  curl_close($curl);
  return json_decode($json, true);
}



function vkApi_upload($url, $file_name) {
  $curl = curl_init($url);
  curl_setopt($curl, CURLOPT_POST, true);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_POSTFIELDS, array('file' => new CURLfile($file_name)));
  $json = curl_exec($curl);
  curl_close($curl);
  return json_decode($json, true);
}


function vkApi_save($hash, $image, $api_key) {
  $curl = curl_init('https://api.vk.com/method/appWidgets.saveGroupImage');
  curl_setopt($curl, CURLOPT_POST, true);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_POSTFIELDS, array('hash' => $hash, 'image' => $image, 'access_token' => $api_key, 'v' => '5.68'));
  $json = curl_exec($curl);
  curl_close($curl);
  return json_decode($json, true);
}