Adding base_url() to header

Question

Is it possible to have something like the following but which actually works?

header('location: base_url(). page.php?x=3'); 

Answer 1

I used this for delayed redirect in header:

header('Refresh:5; url= '. base_url().'/YOURcontrollerName_or_functionName'); 

Answer 2

Try with:

header('Location: ' . base_url() . '/page.php?x=3');