I want to know if it's possible to add a global variable all through the site (so that if I need to change it, I would only need to do it once).

It's for an URL.

  • Can you please give more context on what you're trying to do and why?
    – Ryan Hoerr
    Commented Jul 2, 2018 at 16:52
  • Let me know if you have any issue Commented Jul 3, 2018 at 8:32

1 Answer 1


You can use core session to store the value to access globally

use Magento\Framework\Session\SessionManagerInterface as CoreSession;

class MyClass

    protected $_coreSession;

    public function __construct(
        CoreSession $coreSession
    ) {
        $this->_coreSession = $coreSession;

    public function setValue(){
        $this->_coreSession->setMyVariable('My variable value');

Now you can get your variable value anywhere by core seesion

    public function getValue(){
        return $this->_coreSession->getMyVariable();

You can also unset session variable by

    public function unsetValue(){
        return $this->_coreSession->unsMyVariable();

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