make file download with slim framework ref: http://help.slimframework.com/discussions/questions/359-file-download

make-file-download.php

$app = new \Slim\Slim();

$app->get('/downloadlog', function () use($app) {
    $log = 'mylogfile.log';
    $res = $app->response();
    $res['Content-Description'] = 'File Transfer';
    $res['Content-Type'] = 'application/octet-stream';
    $res['Content-Disposition'] ='attachment; filename=' . basename($log);
    $res['Content-Transfer-Encoding'] = 'binary';
    $res['Expires'] = '0';
    $res['Cache-Control'] = 'must-revalidate';
    $res['Pragma'] = 'public';
    $res['Content-Length'] = filesize($log);
    readfile($log);
});

$app->run();