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I have a node with user entity reference field. Now I want to get newly added users id's to this node via this field in hook_node_update

What is the best way?

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The $node argument to hook_node_update contains a $node->original object. With that you can identify the newly added user IDs by comparing $node->your_user_ref_field to $node->original->your_user_ref_field.

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