Нормальным языком про анимированные Gif - CommunityBuilder

               // resize to thumbnail...
            	if(!$this->resizeImage($file, $thumbfile, $this->_thumbwidth, $this->_thumbheight, $filename)){
                   $this->raiseError("Error: resizing thumbnail image failed.");
                   return false;
               }

               // resize to thumbnail...
// resize thumb fix - check if the image file is bigger than allowed thumbnail
              if($imginfo[0] > $this->_thumbwidth || $imginfo[1] > $this->_maxheight){
                if(!$this->resizeImage($file, $thumbfile, $this->_thumbwidth, $this->_thumbheight, $filename)){
                   $this->raiseError("Error: resizing thumbnail image failed.");
                   return false;
                }
// resize thumb fix - else, just copy the file to the thumbnail file
               } else {
                    if (!@copy($file, $thumbfile)){
                        // some error occured while copying the file to the thumbnail file
                        $this->raiseError("Error occurred copying the uploaded file to the thumbnail.");
                        return false;
                    }
               }