WP PHP - function to append login/logut element to the end of navigation menu

add_login_logout_link_to_menu.php

add_filter( 'wp_nav_menu_items', 'add_login_logout_menu', 20, 5);
function add_login_logout_menu($items, $args){
	  //this will assign the new menu elements to the many that is attached to "top" Display location (menu location)
    if( $args->theme_location != 'top') {
    	return $items; 
    }
    //checks to see if we need the login or logout menu displayed
    if( is_user_logged_in( ) ){
        $link = '<a href="' . wp_logout_url('/index.php') . '" title="Logout">' . __( 'Logout' ) . '</a>';
    } else  {
        $link = '<a href="' . '/wp-login.php' . '" title="Login">' . __( 'Login' ) . '</a>';
    }

    return $items .= '<li id="login_logout_menu-link" class="menu-item menu-type-link">'. $link . '</li>';
}