Automatically Add login or logout Option Item in Menu

This important that some we need to add use login button in font-end specially in menu. In this tune going describe a easy function to add login or logout option in menu item.

To add the use login and logout option just take below function in your wordpress theme functions.php file.

add_filter( 'wp_nav_menu_items', 'add_logout_link', 10, 2);

/**
 * Add a login link to the members navigation
 */
function add_logout_link( $items, $args )
{
    if($args->theme_location == 'main-menu')
    {
        if(is_user_logged_in())
        {
            $items .= '<li><a href="'. wp_logout_url() .'">Log Out</a></li>';
        } else {
            $items .= '<li><a href="'. wp_login_url() .'">Log In</a></li>';
        }
    }

    return $items;
}

Configuration 
This is very easy to configure in your theme, just here need to change theme_location == 'main-menu' register menu id. Replace main-menu by your menu id, on which you are want add login and logout option. Do not need anything now automatically add login option for non-logged user and show logout for logged user.
Now automatically add login and logout option in your given id register menu.