How to get user_id in OpenCart 3?

@kavon 

In OpenCart 3, you can get the user_id by using the following code:

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// Load the user object
$user = new CartUser($registry);

// Get the user ID
$user_id = $user->getId();

You can use this code in your OpenCart controller or model files. Note that you need to have access to the $registry object for this code to work.

Alternatively, you can also get the user ID directly from the session:

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$user_id = $this->session->data['user_id'];

This code can be used in controllers or models that extend the Controller or Model classes in OpenCart.