Exemplo de como implementar download de arquivos no zend framework2 de forma eficiente!

DownloadController.php

<?php

namespace Application\Controller;

use Zend\Mvc\Controller\AbstractActionController;

class DownloadController extends AbstractActionController
{
	public function indexAction()
	{	
		$response = $this->createStreamResponseFromFile("/var/www/arquivo.zip");
		if($response) {
			return $response;
		}
		
		echo "arquivo não encontrado";
		return $this->response;
	}
	
	/**
	 * Cria stream de resposta http a partir de um arquivo
	 * Função utilizada para implementar download de arquivos no zf2
	 * @param string $filepath
	 * @return \Zend\Http\Response\Stream
	 */
	public static function createStreamResponseFromFile($filepath)
	{
		if(!file_exists($filepath)) {
			return false;
		}
		
		$response = new \Zend\Http\Response\Stream();
		$response->setStream(fopen($filepath, 'r'));
		$response->setStatusCode(200);
		$response->setStreamName(basename($filepath));
			
		$headers = new \Zend\Http\Headers();
		$headers->addHeaders(array(
				'Content-Disposition' => 'attachment; filename="' . basename($filepath) .'"',
				'Content-Type' => 'application/octet-stream',
				'Content-Length' => filesize($filepath)
		));
		$response->setHeaders($headers);
		return $response;
	}
}