I'm a beginner at PHP and Magento have developed a Magento2 extension and used this line code in it:

require_once '/../knownuserv3/KnownUser.php';

But when I tried to put my extension in Magento Store, I got a series of test failure from Code Sniffer, which I solved all but for this one couldn't find any solution until now. knownuser is a class in another library includes a static method which I need to call it. this is the error text from Code Sniffer: enter image description here

  • 4
    Possible duplicate of How to use require_once in magento 2
    – Mohit Rane
    Sep 5, 2019 at 13:02
  • No, it didn't work, I tried to use object manager and dependency injection but still I needed to use require_once to load the related class. I don't understand why shouldn't we use require_once and what is the replacement for it?!
    – S.Cheginy
    Sep 9, 2019 at 9:41
  • have you tried using use vendor\module\classname; ?
    – Mohit Rane
    Sep 9, 2019 at 9:57
  • Yes, I tried this as well. but the problem is that the class that I'm using it is a third party library so it seems it doesn't load before using require!
    – S.Cheginy
    Sep 9, 2019 at 10:06

1 Answer 1


Try This Code


namespace VendoreName\ModuleName\Controller\Index;

use Magento\Framework\App\Action\Action;
use Zend_Loader;

class GetPdfData extends \Magento\Framework\App\Action\Action
     * @var \Magento\Framework\View\Result\PageFactory
    protected $resultPageFactory;

     * @var \Magento\Framework\Filesystem\DirectoryList
    protected $dir;

     * @param \Magento\Framework\App\Action\Context $context
     * @param \Magento\Framework\Filesystem\DirectoryList $dir
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\Filesystem\DirectoryList $dir,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        $this->dir = $dir;
        $this->resultPageFactory = $resultPageFactory;

     * Construct initialization of mpdf library
    protected function initializePDF()

        $path = $this->dir->getRoot() . "/vendor/mpdf/mpdf/src/";

        $this->pdf = $path . 'Mpdf.php';

        //include_once $this->pdf;
        Zend_Loader::loadFile($this->pdf, null, true);

        $this->configvariables = $path . 'Config/ConfigVariables.php';

        // require_once $this->configvariables;
        Zend_Loader::loadFile($this->configvariables, null, true);

     * @inheritdoc
    public function execute()
        echo "Your Code";

Note: Here we need to add absolute path of files which we want to include_once or require_once. MPdf is installing via composer require mpdf/mpdf command and this module placed into the vendor directory.

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