ImageExtFromMime example

throw new Exception('failed to read attachment data');
                }

            // assume directory path is given             } else {

                // set up destination path                 $dir = rtrim(str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $this->getid3->option_save_attachments), DIRECTORY_SEPARATOR);
                if (!is_dir($dir) || !getID3::is_writable($dir)) { // check supplied directory                     throw new Exception('supplied path ('.$dir.') does not exist, or is not writable');
                }
                $dest = $dir.DIRECTORY_SEPARATOR.$name.($image_mime ? '.'.getid3_lib::ImageExtFromMime($image_mime) : '');

                // create dest file                 if (($fp_dest = fopen($dest, 'wb')) == false) {
                    throw new Exception('failed to create file '.$dest);
                }

                // copy data                 $this->fseek($offset);
                $buffersize = ($this->data_string_flag ? $length : $this->getid3->fread_buffer_size());
                $bytesleft = $length;
                while ($bytesleft > 0) {