Redirect to wp-login.php if user is not logged in

redirect-to-login-if-not-logged-in.php

<?php
/**
 * @package Redirect to login if not logged in
 * @version 1.5
 */
/*
Plugin Name: Redirect to login if not logged in
Plugin URI: http://wordpress.org/plugins/redirect-to-login-if-not-logged-in/
Description: Redirects a user to the login page if the user is not logged in. After login the user gets redirected to the original entry page.
Author: Daan Kortenbach
Version: 1.5
Author URI: http://daan.kortenba.ch/
*/

add_action( 'parse_request', 'dmk_redirect_to_login_if_not_logged_in', 1 );
/**
 * Redirects a user to the login page if not logged in.
 *
 * @author Daan Kortenbach
 */
function dmk_redirect_to_login_if_not_logged_in() {
	is_user_logged_in() || auth_redirect();
}


add_filter( 'login_url', 'dmk_strip_loggedout', 1, 1 );
/**
 * Strips '?loggedout=true' from redirect url after login.
 *
 * @author Daan Kortenbach
 *
 * @param  string $login_url
 * @return string $login_url
 */
function dmk_strip_loggedout( $login_url ) {
	return str_replace( '%3Floggedout%3Dtrue', '', $login_url );
}