php 扫描 下载 apk

        $file = 'C:\WebSiteDirectory\CarparkWeixinBackend\Dplus.apk';
        if (file_exists($file)) {
             header('Content-Description: File Transfer');
             header('Content-Type: application/vnd.android.package-archive');
             header('Content-Disposition: attachment; filename='.basename($file));
             header('Content-Transfer-Encoding: binary');
             header('Expires: 0');
             header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
             header('Pragma: public');
             header('Content-Length: ' . filesize($file));
             ob_clean();
             flush();
             readfile($file);
             exit;
         }