如何在wordpress中程序地显示自定义帖子类型的图像缩略图。

function create_custom_post_type() {
    register_post_type('custom_post',
        array(
            'labels' => array(
                'name' => 'Custom Posts',
                'singular_name' => 'Custom Post'
            ),
            'public' => true,
            'has_archive' => true,
            'supports' => array('title', 'editor', 'thumbnail')
        )
    );
}
add_action('init', 'create_custom_post_type');

add_theme_support('post-thumbnails', array('custom_post'));

if (has_post_thumbnail()) {
    the_post_thumbnail();
}