Menu highlight post type and custom page template. #wordpress

untitled

add_action('nav_menu_css_class', 'add_current_nav_class', 10, 2 );

function add_current_nav_class($classes, $item) {

	// Getting the current post
	global $post;

    $current_post_type = get_post_type($post->ID); // post, c45_project
    $item_page_id = get_post_meta( $item->ID, '_menu_item_object_id', true );
    $template_name = get_page_template_slug($item_page_id); // template-projekte.php, template-news.php

    if (($current_post_type == 'post' && $template_name == 'template-news.php') || ($current_post_type == 'c45_project' && $template_name == 'template-projekte.php' )) {
        $classes[] = 'current-menu-item';
    }

	// Return the corrected set of classes to be added to the menu item
	return $classes;

}