Shows how to add a "My Store" menu item linking to the current user's Dokan store

add-my-store-menu-item.php

<?php

/**
 * Adds support for adding a "My Store" link to a WP nav menu.
 *
 * This works by finding all menu items with the URL "#dokan-my-store" and
 * replacing "#dokan-my-store" with the current user's storefront URL. If the
 * current user is not a vendor or Dokan is not active these menu items will
 * be hidden instead.
 *
 * @param array $items Menu items.
 *
 * @return array
 */
function dokan_handle_my_store_menu_item( $items ) {
	// We only want to change the menu item URL on the frontend
	if ( is_admin() ) {
		return $items;
	}

	foreach ( $items as $key => $item ) {
		if ( '#dokan-my-store' === $item->url ) {
			// Hide menu item if Dokan is not active
			if ( ! function_exists( 'dokan_get_current_user_id' ) ) {
				unset( $items[ $key ] );
				continue;
			}
			// Set correct URL if user is seller or hide menu item otherwise
			$user_id   = dokan_get_current_user_id();
			$is_seller = dokan_is_user_seller( $user_id );
			if ( $is_seller ) {
				$items[ $key ]->url = dokan_get_store_url( $user_id );
			} else {
				unset( $items[ $key ] );
			}
		}
	}

	return $items;
}

add_filter( 'wp_get_nav_menu_items', 'dokan_handle_my_store_menu_item' );