CSV - Magento 2

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<?php /** * * Copyright © 2016 Magento. All rights reserved. * See COPYING.txt for license details. */ namespace [Your_NameSpace]\[Your_Module]\Controller\Download; use Magento\Framework\App\Action\Context; use Magento\Framework\View\Result\PageFactory; class Download extends \Magento\Framework\App\Action\Action { /** * @var \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory */ protected $_productCollectionFactory;     public function __construct(     Context $context,     \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory ) {     $this->_productCollectionFactory = $productCollectionFactory;     parent::__construct($context); } public function execute() {     $notificationId = $this->getRequest()->getParam('notification_id');     $heading = [         __('Id'),         __('SKU'),         __('Name')     ];     $outputFile = "ListProducts". date('Ymd_His').".csv";     $handle = fopen($outputFile, 'w');     fputcsv($handle, $heading);     foreach ($productCollection as $product) {         $row = [             $product->getId(),             $product->getSku(),             $product->getName()                    ];         fputcsv($handle, $row);     }     $this->downloadCsv($outputFile); } public function downloadCsv($file) {     if (file_exists($file)) {         //set appropriate headers         header('Content-Description: File Transfer');         header('Content-Type: application/csv');         header('Content-Disposition: attachment; filename='.basename($file));         header('Expires: 0');         header('Cache-Control: must-revalidate');         header('Pragma: public');         header('Content-Length: ' . filesize($file));         ob_clean();flush();         readfile($file);     } } }