Hide front-end from every logged out user and redirect them to the default login page

Question

I want to hide the front-end from every visitor/logged out user. To see the front-end, every user must have been registered and logged in.

Any visitor that's logged out should be redirected to the default WordPress login page.

Answer 1

One way of doing this would be to add the code below to the top of your template file(s):

<?php // redirect to login page if user is not logged in 
if ( !is_user_logged_in() ) :
    header('Location: /wp-login.php');
    exit();
endif;
?>

There are some subtleties around redirecting in PHP that you may want to consider, but for me the above code works.