如何创建过滤器以显示自定义帖子类型

function create_custom_post_type() {
    $labels = array(
        'name' => '产品',
        'singular_name' => '产品',
        'menu_name' => '产品',
        'add_new' => '添加新产品',
        'add_new_item' => '添加新产品',
        'edit_item' => '编辑产品',
        'new_item' => '新产品',
        'view_item' => '查看产品',
        'search_items' => '搜索产品',
        'not_found' => '未找到产品',
        'not_found_in_trash' => '回收站中未找到产品'
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'has_archive' => true,
        'menu_icon' => 'dashicons-products',
        'supports' => array('title', 'editor', 'thumbnail', 'excerpt', 'custom-fields'),
    );

    register_post_type('product', $args);
}
add_action('init', 'create_custom_post_type');