Symfony2 create and download zip file

SYMFONY 3 - 4 example :

use Symfony\Component\HttpFoundation\Response;

/**
* Create and download some zip documents.
*
* @param array $documents
* @return Symfony\Component\HttpFoundation\Response
*/
public function zipDownloadDocumentsAction(array $documents)
{
    $files = [];
    $em = $this->getDoctrine()->getManager();

    foreach ($documents as $document) {
        array_push($files, '../web/' . $document->getWebPath());
    }

    // Create new Zip Archive.
    $zip = new \ZipArchive();

    // The name of the Zip documents.
    $zipName = 'Documents.zip';

    $zip->open($zipName,  \ZipArchive::CREATE);
    foreach ($files as $file) {
        $zip->addFromString(basename($file),  file_get_contents($file));
    }
    $zip->close();

    $response = new Response(file_get_contents($zipName));
    $response->headers->set('Content-Type', 'application/zip');
    $response->headers->set('Content-Disposition', 'attachment;filename="' . $zipName . '"');
    $response->headers->set('Content-length', filesize($zipName));

    @unlink($zipName);

    return $response;
}

Since Symfony 3.2+ can use file helper to let file download in browser:

public function someAction()
{
    // create zip file
    $zip = ...;

    $this->file($zip);    
}

solved:

$zip->close();
header('Content-Type', 'application/zip');
header('Content-disposition: attachment; filename="' . $zipName . '"');
header('Content-Length: ' . filesize($zipName));
readfile($zipName);

apparently closing the file is important ;)