Folder::isWritable PHP Method

    public function isWritable($recursive = false)
    {
        if ($recursive) {
            if (!$this->isWritable()) {
                return false;
            }
            foreach ($this->content() as $f) {
                if (!$f->isWritable(true)) {
                    return false;
                }
            }
            return true;
        }
        return is_writable($this->root);
    }

 public function redactor__upload()
 {
     if (!Auth::getCurrentMember()) {
         exit("Invalid Request");
     }
     $path = Request::get('path');
     $is_image = Request::get('is_image');
     if (isset($path)) {
         $dir = Path::tidy(ltrim($path, '/') . '/');
         if (isset($_POST['subfolder'])) {
             $dir .= $_POST['subfolder'] . '/';
         }
         Folder::make($dir);
         $file_type = strtolower($_FILES['file']['type']);
         $file_info = pathinfo($_FILES['file']['name']);
         // pull out the filename bits
         $filename = $file_info['filename'];
         $ext = $file_info['extension'];
         // build filename
         $file = $dir . $filename . '.' . $ext;
         // check for dupes
         if (File::exists($file)) {
             $file = BASE_PATH . '/' . $dir . $filename . '-' . date('YmdHis') . '.' . $ext;
         }
         if (!Folder::isWritable($dir)) {
             Log::error('Upload failed. Directory "' . $dir . '" is not writable.', 'redactor');
             echo json_encode(array('error' => "Redactor: Upload directory not writable."));
             die;
         }
         if ($is_image && ($_FILES['file']['type'] == 'image/png' || $_FILES['file']['type'] == 'image/jpg' || $_FILES['file']['type'] == 'image/gif' || $_FILES['file']['type'] == 'image/jpeg')) {
             if (Request::get('resize', false)) {
                 $image = Image::make($_FILES['file']['tmp_name']);
                 $width = Request::get('width', null);
                 $height = Request::get('height', null);
                 $ratio = Request::get('ratio', true);
                 $upsize = Request::get('upsize', false);
                 $quality = Request::get('quality', '75');
                 $image->resize($width, $height, $ratio, $upsize)->save($file, $quality);
             } else {
                 move_uploaded_file($_FILES['file']['tmp_name'], $file);
             }
         } else {
             move_uploaded_file($_FILES['file']['tmp_name'], $file);
         }
         $return = array('filelink' => Path::toAsset($file));
         echo stripslashes(json_encode($return));
     } else {
         echo json_encode(array('error' => "Redactor: Upload directory not set."));
     }
 }