Horde_Browser::downloadHeaders PHP Method

    public function downloadHeaders($filename = 'unknown', $cType = null, $inline = false, $cLength = null)
    {
        /* Remove linebreaks from file names. */
        $filename = str_replace(array("\r\n", "\r", "\n"), ' ', $filename);
        /* Some browsers don't like spaces in the filename. */
        if ($this->hasQuirk('no_filename_spaces')) {
            $filename = strtr($filename, ' ', '_');
        }
        /* MSIE doesn't like multiple periods in the file name. Convert all
         * periods (except the last one) to underscores. */
        if ($this->isBrowser('msie')) {
            if ($pos = strrpos($filename, '.')) {
                $filename = strtr(substr($filename, 0, $pos), '.', '_') . substr($filename, $pos);
            }
            /* Encode the filename so IE downloads it correctly. (Bug #129) */
            $filename = rawurlencode($filename);
        }
        /* Content-Type/Content-Disposition Header. */
        if ($inline) {
            if (!is_null($cType)) {
                header('Content-Type: ' . trim($cType));
            } elseif ($this->isBrowser('msie')) {
                header('Content-Type: application/x-msdownload');
            } else {
                header('Content-Type: application/octet-stream');
            }
            header('Content-Disposition: inline; filename="' . $filename . '"');
        } else {
            if ($this->isBrowser('msie')) {
                header('Content-Type: application/x-msdownload');
            } elseif (!is_null($cType)) {
                header('Content-Type: ' . trim($cType));
            } else {
                header('Content-Type: application/octet-stream');
            }
            if ($this->hasQuirk('break_disposition_header')) {
                header('Content-Disposition: filename="' . $filename . '"');
            } else {
                header('Content-Disposition: attachment; filename="' . $filename . '"');
            }
        }
        /* Content-Length Header. Only send if we are not compressing
         * output. */
        if (!is_null($cLength) && !in_array('ob_gzhandler', ob_list_handlers())) {
            header('Content-Length: ' . $cLength);
        }
        /* Overwrite Pragma: and other caching headers for IE. */
        if ($this->hasQuirk('cache_ssl_downloads')) {
            header('Expires: 0');
            header('Cache-Control: must-revalidate');
            header('Pragma: public');
        }
    }

                $defaultimg .= "blankmovie.png";
                break;
            default:
                $mime = 'image/png';
                $defaultimg .= "blankalbum.png";
                break;
        }
        $image = file_get_contents($defaultimg);
    } else {
        if ($_GET['thumb']) {
            $thumb_data = $art->get_thumb($size);
            $etag .= '-' . $_GET['thumb'];
        }
        $mime = isset($thumb_data['thumb_mime']) ? $thumb_data['thumb_mime'] : $art->raw_mime;
        $image = isset($thumb_data['thumb']) ? $thumb_data['thumb'] : $art->raw;
    }
}
if (!empty($image)) {
    $extension = Art::extension($mime);
    $filename = scrub_out($filename . '.' . $extension);
    // Send the headers and output the image
    $browser = new Horde_Browser();
    if (!empty($etag)) {
        header('ETag: ' . $etag);
        header('Cache-Control: private');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s \\G\\M\\T', time()));
    }
    header("Access-Control-Allow-Origin: *");
    $browser->downloadHeaders($filename, $mime, true);
    echo $image;
}