Add a menu to WordPress page with PHP action hooks

Adding a menu to WordPress via PHP and action hooks requires three steps, registering the menu location, assigning a menu to it and then placing the menu with an action hook.

Register WordPress Menu

Registering a menu is done with register_nav_menu, below is an example to register a ‘Store Menu’ menu.

add_action( 'init', 'wpb_custom_new_menu' );
/**
 * Register New Store Menu
 */
function wpb_custom_new_menu() {
    register_nav_menu('store-menu',__( 'Store Menu' ));
}

Once it is registered it is visible in the WP dashboard, Appearance > Menus.

Assign WordPress Menu to new location

The next step is to create a menu and assign the new location to it, easy enough!

Position the Menu

So now you can position the menu using a number of hooks, a function and WordPress internal function wp_nav_menu

add_action( 'woocommerce_before_single_product', 'store_menu_placement' ); 
/**
 * Place New Store Menu
 */
function store_menu_placement() {

    wp_nav_menu( array( 
        'theme_location' => 'store-menu', 
        'container_class' => 'store-menu-class' ) );
}

So in my example I am placing this menu on single WooCommerce products just before the product details, I am using the theme location ‘store-menu’ as per the menu registration and including a CSS class in the containing element.

Adding some CSS

Finally you can add some CSS styles to get you up and running.

/* Store Menu */

.store-menu-class ul {
    margin:0 0px 20px 0px;
    list-style-type: none;
    list-style: none;
    list-style-image: none;
    text-align:right;
}
.store-menu-class li {
    padding: 0px 20px 0px 0px;
    display: inline;
} 
.store-menu-class a { 
    color:#27408f;
}

.store-menu-class a:hover { 
    color:#428bca;
}

@media (min-width:1024px) {
	.store-menu-class {
		position: absolute;
		right: 0;
		top: 1px;
	}
}

Edit to suit your needs.