Method download

public static function download($item, $backLink, $extLink = 0)
{
    // If you comment or remove the following line, user will be able to download external images
    // but it can happen that such will be stored on your server in root (the example is picasa images)
    $extLink = 0;
    $app = Factory::getApplication();
    if (empty($item)) {
        $msg = Text::_('COM_PHOCAGALLERY_ERROR_DOWNLOADING_FILE');
        $app->enqueueMessage($msg, 'error');
        $app->redirect($backLink);
        return false;
    } else {
        if ($extLink == 0) {
            phocagalleryimport('phocagallery.file.file');
            $fileOriginal = PhocaGalleryFile::getFileOriginal($item->filenameno);
            if (!File::exists($fileOriginal)) {
                $msg = Text::_('COM_PHOCAGALLERY_ERROR_DOWNLOADING_FILE');
                $app->enqueueMessage($msg, 'error');
                $app->redirect($backLink);
                return false;
            }
            $fileToDownload = $item->filenameno;
            $fileNameToDownload = $item->filename;
        } else {
            $fileToDownload = $item->exto;
            $fileNameToDownload = $item->title;
            $fileOriginal = $item->exto;
        }
        // Clears file status cache
        clearstatcache();
        $fileOriginal = $fileOriginal;
        $fileSize = @filesize($fileOriginal);
        $mimeType = PhocaGalleryFile::getMimeType($fileToDownload);
        $fileName = $fileNameToDownload;
        if ($extLink > 0) {
            $content = '';
            if (function_exists('curl_init')) {
                $ch = curl_init();
                curl_setopt($ch, CURLOPT_URL, $fileOriginal);
                curl_setopt($ch, CURLOPT_HEADER, 0);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                $downloadedFile = fopen($fileName, 'w+');
                curl_setopt($ch, CURLOPT_FILE, $downloadedFile);
                $content = curl_exec($ch);
                $fileSize = strlen($content);
                curl_close($ch);
                fclose($downloadedFile);
            }
            if ($content != '') {
                // Clean the output buffer
                ob_end_clean();
                header("Cache-Control: public, must-revalidate");
                header('Cache-Control: pre-check=0, post-check=0, max-age=0');
                header("Pragma: no-cache");
                header("Expires: 0");
                header("Content-Description: File Transfer");
                header("Expires: Sat, 30 Dec 1990 07:07:07 GMT");
                header("Content-Type: " . (string) $mimeType);
                header("Content-Length: " . (string) $fileSize);
                header('Content-Disposition: attachment; filename="' . $fileName . '"');
                header("Content-Transfer-Encoding: binary\n");
                echo $content;
                exit;
            }
        } else {
            // Clean the output buffer
            ob_end_clean();
            header("Cache-Control: public, must-revalidate");
            header('Cache-Control: pre-check=0, post-check=0, max-age=0');
            header("Pragma: no-cache");
            header("Expires: 0");
            header("Content-Description: File Transfer");
            header("Expires: Sat, 30 Dec 1990 07:07:07 GMT");
            header("Content-Type: " . (string) $mimeType);
            // Problem with IE
            if ($extLink == 0) {
                header("Content-Length: " . (string) $fileSize);
            }
            header('Content-Disposition: attachment; filename="' . $fileName . '"');
            header("Content-Transfer-Encoding: binary\n");
            @readfile($fileOriginal);
            exit;
        }
    }
    return false;
}