Modify Menu Items

To modify the WordPress menu items, you can use the wp_nav_menu_items filter in your theme’s functions.php file. The following code snippet will add a new menu item to the primary menu:

function wpsnippets_menu_items ( $items, $args ) {

    if ($args->theme_location == 'primary') {
        $items .= '<li><a href="' . esc_url( home_url( '/custom-page' ) ) . '">Custom Page</a></li>';
    }

    return $items;
}

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

This code adds a new menu item to the primary menu by appending HTML code to the existing menu items. The site_url() function is used to generate the URL of the custom page, and this URL is included in the href attribute of the new menu item. You can modify the site_url('/custom-page') part of the code to use the URL of the page you want to link to.

If you want to remove an existing menu item, you can use a similar approach:

function wpsnippets_remove_menu_item( $items, $args ) {

    if ($args->theme_location == 'primary') {
        $items = str_replace( '<menu-item-html>, '', $items );
    }

    return $items;
}

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

This code uses the str_replace() function to replace the HTML code for a specific menu item with an empty string. You can modify the <menu-item-html> part of the code to match the HTML code for the menu item you want to remove.