简单的 图片下载 php

/**
 * @param Q_Request  $input
 * @param Q_Response $output
 */
public function doDownload(Q_Request $input, Q_Response $output)
{

    $qrCodePath = "二维码路径/其他图片路径";

    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . basename($qrCodePath) . '"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($qrCodePath));
    readfile($qrCodePath);
    Q::end();
}