Is it possible to grab a variable from a component inside another component?

Question

Im sure the title sound a bit complex or lame. Im trying to develop a component that will keep the count of users that Added a product in the cart but didnt finish with a checkout ( canceled the order before paying ) .

I created a new table in the db and in the controller of virtuemart i added this code: components/com_virtuemart/controllers/cart.php

function add() {
        $tmp = JFactory::getUser();
        $db= JFactory::getDbo();
        $ready = $db->getQuery(true);
        $query= "INSERT INTO #__nobuyers (id,name,email) VALUES ( '". $tmp->id ."','". $tmp->username ."','". $tmp->email ."') ";
        $db->setQuery($query);
        $db->execute();   
        /*
        $session =& JFactory::getSession();
        $session->set( 'cartcheck', 'cartisnotempybro' );
        $GLOBALS['yoyo']=notempty;
        */





public function confirm() {
        $tmp = JFactory::getUser();
        $db= JFactory::getDbo();
        $ready = $db->getQuery(true);
        $query= "DELETE FROM #__nobuyers where ID=". $tmp->id;
        $db->setQuery($query);
        $db->execute();  

SO when a Registered and Loged user will add a product in his cart i keep his info at my db. If he checkout i remove him. This is working fine. The problem is when a user first add a product to the cart and logs in after. So what im trying to do is : When a user add a product in a cart, keep a global flag variable. After that edit the com_users/controllers/user.php login() function so when someone try to login check if the flag is set ( someone added a product in the cart ) and if so, add him in database right after log in.

Something like that :

$session = JFactory::getSession();
$seccode=$session->get('cartcheck');
if ($seccode) {
or
if (!empty($GLOBAL['yoyoyo'])) { //do stuff

ALtough i try to access a variable setted from com_virtuemart inside the com_users.The var_dumps i used returns NULL. Is it possible ? And if yes how we achieve that ?

Answer 1

Beyond the fact that your "global" variable is changing ($GLOBALS['yoyo'] is not at all the same as $GLOBAL['yoyoyo']), all variables except the session (which you also appear to be using) will not persist between page loads.

So you are correct in trying to use the session. However, the session will be reset to a degree after the user logs in. You would likely have to add some code before login to check if the value exists and store it in another variable, and then after login check that variable to actually update the db.

Another solution, that I think would be simpler, is to not save the data at all on your end and just write a user plugin that checks for onUserLogin. Within that function, if the user has successfully logged in, check if their cart has any items in it. If so, add them to your database.

References for you:

Creating a plugin: https://docs.joomla.org/Creating_a_Plugin_for_Joomla

Are there items in the cart: https://stackoverflow.com/questions/13929564/how-to-get-all-products-in-cart-in-virtuemart