functions + cpt

//  FAQS CPT
add_action( 'init', 'spc_faqs_custom_post_type' );
function spc_faqs_custom_post_type()
{
    register_post_type( 'faqs',
        array('labels' =>
            array(
                'name' => __( 'FAQs' ),
                'singular_name' => __( 'faqs' ),
                'menu_name' => __( 'FAQs' ),
                'all_items' => __( 'All FAQs' ),
                'add_new' => __( 'Add New FAQ' ),
                'add_new_item' => __( 'Add New Page to the FAQs' ),
                'edit_item' => __( 'Edit Page - faqs' ),
                'new_item' => __( 'Add New Page - faqs' ),
                'view_item' => __( 'View Page' ),
                'search_items' => __( 'Search faqs' ),
                'not_found' => __( 'No pages found' ),
                'not_found_in_trash' => __( 'No pages found in trash' )
            ),
            'public' => true,
            'hierarchical' => true,
            'has_archive' => true,
            'exclude_from_search' => true,
            'menu_icon' => 'dashicons-feedback',
            'supports' =>
                array(
                    'title',
                    'editor',
                    'page-attributes',
                    'thumbnail',
                    'custom-fields',
                    'revisions',
            ),
            'capability_type' => 'post',
            'rewrite' => array(
                        'slug' => 'faqs',
                        'with_front' => false // Permalinks format
                    ),
            'show_ui' => true,
            'show_in_nav_menus' => true,
            'show_in_menu' => true,
            'menu_position' => 4,
        )

    );
}


//  FAQS Taxes
if ( ! function_exists( 'faq_taxonomy' ) ) {

// Register Custom Taxonomy
function faq_taxonomy() {

    $labels = array(
        'name'                       => _x( 'FAQ Categories', 'Taxonomy General Name', 'text_domain' ),
        'singular_name'              => _x( 'FAQ Category', 'Taxonomy Singular Name', 'text_domain' ),
        'menu_name'                  => __( 'FAQ Categories', 'text_domain' ),
        'all_items'                  => __( 'All FAQ Categories', 'text_domain' ),
        'parent_item'                => __( 'Parent FAQ Category', 'text_domain' ),
        'parent_item_colon'          => __( 'Parent FAQ Category:', 'text_domain' ),
        'new_item_name'              => __( 'New FAQ Category', 'text_domain' ),
        'add_new_item'               => __( 'Add New FAQ Category', 'text_domain' ),
        'edit_item'                  => __( 'Edit FAQ Category', 'text_domain' ),
        'update_item'                => __( 'Update FAQ Category', 'text_domain' ),
        'view_item'                  => __( 'View FAQ Category', 'text_domain' ),
        'separate_items_with_commas' => __( 'Separate items with commas', 'text_domain' ),
        'add_or_remove_items'        => __( 'Add or remove FAQ Categories', 'text_domain' ),
        'choose_from_most_used'      => __( 'Choose from the most used', 'text_domain' ),
        'popular_items'              => __( 'Popular FAQ Category', 'text_domain' ),
        'search_items'               => __( 'SearchF AQ Category', 'text_domain' ),
        'not_found'                  => __( 'FAQ Category Not Found', 'text_domain' ),
        'no_terms'                   => __( 'No items', 'text_domain' ),
        'items_list'                 => __( 'FAQ Category list', 'text_domain' ),
        'items_list_navigation'      => __( 'FAQ Category list navigation', 'text_domain' ),
    );
    $args = array(
        'labels'                     => $labels,
        'hierarchical'               => true,
        'public'                     => true,
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => true,
        'show_tagcloud'              => true,
    );
    register_taxonomy( 'faq_cat', array( 'faqs' ), $args );

}
add_action( 'init', 'faq_taxonomy', 0 );

}
//  FAQS Filters
function filter_faqs() {
$termIds = array('1821','1820');
  $ajaxposts = new WP_Query([
    'post_type' => 'faqs',
    'posts_per_page' => -1,
    'orderby' => 'menu_order',
    'order' => 'desc',
    'tax_query' => [
        [
        'taxonomy' => 'faq_cat',
         'field'    => 'term_id',
         'terms'    =>  $termIds,
         'operator' => 'IN'
    ],
    ]
  ]);

  $response = '';

  if($ajaxposts->have_posts()) {
    while($ajaxposts->have_posts()) : $ajaxposts->the_post();
       $response .= get_template_part('templates/faq-single');
    endwhile;
  } else {
    $response = 'empty';
  }

  echo $response;
  exit;
}
add_action('wp_ajax_filter_faqs', 'filter_faqs');
add_action('wp_ajax_nopriv_filter_faqs', 'filter_faqs');