Require login to view WordPress site

You may want to force users to login in order to view a page within your WordPress site.

You can use the following code to do that:

	add_action('template_redirect','giga_check_if_logged_in');
	function giga_check_if_logged_in()
	{
	    if(!is_user_logged_in()) //Are they logged in? If not:
	    {
	        // Get the requested URL
	        global $wp;
	        $requested_url = home_url( $wp->request );

	        //Set $url to {site_url()}/wp-login.php?redirect_to={$requested_url}
	        $url = add_query_arg(
	            'redirect_to',
	            $requested_url,
	            site_url('wp-login.php')
	        );

	        //redirect any request to {site_url()}/wp-login.php?redirect_to={$requested_url}
	        wp_redirect($url);
	        exit;
	    }
	}