我有一个页面，我在其中嵌入了使用这些代码行函数的页面。php：

//------Embed Content------
//Title
function CustomFunction_ShowPage_Title($id) {
    $post = get_page($id);
    $title = apply_filters(\'the_title\', $post->post_title);
    echo $title;
}

//Content
function CustomFunction_ShowPage_Content($id) {
    $post = get_page($id);
    $content = apply_filters(\'the_content\', $post->post_content);
    echo $content;
}

我如何为特色图片也这样做？我是否简单地替换the_content with 具有the_post_thumbnail?如果是，我应该在第二个参数上加什么？我只是去吗$post->post_thumbnail?

$thumb = get_the_post_thumbnail( $id, \'post-thumbnail\' );