function update_json_file($obj) {
    $dir = 'sites/default/files/json_data/';
    $filename = 'static.json';
    if(!is_dir($dir)) mkdir($dir) ;
    $full_path = $dir.$filename;
    $resourse = fopen($full_path,'r');
    $data = fread($resourse, filesize($full_path));
    fclose($resourse);
    $current_data = json_decode($data);
    if (!$current_data) {
      $current_data = new \stdClass();
    }
    foreach ($obj as $key => $value){
      $current_data->$key = $value;
    }
    $resourse = fopen($full_path,'w+');
    fwrite($resourse, json_encode($current_data));
    fclose($resourse);
  }