always by default show welcome panel in the dashboard

i am looking for solution to show always welcome panel in the dashboard by php code. i know that for every user this parameter is stored in DB.

the question is, how can i check if the login user don't see the "welcome panel", and the check box is not checked, to show the welcome panel, how to make this box be checked by php code and to save this in DB so next time the user will login and see right away the welcome panel.

any suggestions?