Redirect Users to a Custom Log In Page

Relevant for WordPress 4.4: https://core.trac.wordpress.org/ticket/35103

If you’ve created a login page that isn’t at /wp-login.php, here’s a simple way you can redirect users who click on the “Log In” links to your new page:

add_filter( 'login_url', 'new_login_url', 10, 2 );
function new_login_url( $login_url, $redirect ) {
    return '/log-in/';
}