对不起，我的英语不好，但我试试看。

我创建了一个带有短代码的Wordpress主题，以在一列中显示最新的3篇帖子，请参见下图

如果默认图像中没有回退的缩略图的URL，我也尝试了不同的代码。

这是代码

global $post;

$html = "";

$my_latest_posts_widget = new WP_Query( array(
     \'post_type\' => \'post\',
     \'posts_per_page\' => 3
));
$html .= \'<div id="container_recent_posts_widget" class="container_recent_posts_widget">\';
if( $my_latest_posts_widget->have_posts() ) : while( $my_latest_posts_widget->have_posts() ) : $my_latest_posts_widget->the_post();
     $html .= \'<div class="recent_posts_widget_post">\';
     $html .= \'<a href=" \' . get_the_permalink() .\' "><div><img class="attachment-blogthumbhomewidget size-blogthumbhomewidget wp-post-image" src="\' .

    $thumb

      . \'" alt="\' .get_the_title(). \' | \' .get_bloginfo(). \'"/></div></a>\';
     $html .= \'<a href=" \' . get_the_permalink() .\' "><h2 class="recent-posts-widget-title">\' . get_the_title() . \'</h2></a>\';
     $html .= \'<a href=" \' . get_the_permalink() .\' "><p class="recent-posts-widget-text">\' . excerpt(20) . \'</p></a>\';
     $html .= \'<div class="lees-meer-post-div"><a class="lees-meer-post-a" href=" \' . get_the_permalink() .\' "><span class="lees-meer-post-widget">Lees meer</span></a></div> \';
     $html .= "</div>";
endwhile; endif;

echo \'</div>\';

return $html;

我在一个论坛上找到了这段代码，但这给了所有帖子一个默认缩略图。但是第一篇文章“Testje”有一个缩略图，但它会回退到默认图像上。

这是我在那个论坛上找到的代码

    $thumb = get_template_directory_uri() .\'/assets/images/default-image-post-thumbnail-widget.jpg\';
 if ( has_post_thumbnail() ) {
 //override  fallback image if post has any thumbnail
 $thumb = get_the_post_thumbnail_url();
  }

谁能帮我把这件事做对吗？

谢谢！：）

global $post;

$html = "";

$my_latest_posts_widget = new WP_Query( array(
     \'post_type\' => \'post\',
     \'posts_per_page\' => 3
));
$html .= \'<div id="container_recent_posts_widget" class="container_recent_posts_widget">\';

if( $my_latest_posts_widget->have_posts() ) : while( $my_latest_posts_widget->have_posts() ) : $my_latest_posts_widget->the_post();

  $thumb = get_template_directory_uri() .\'/assets/images/default-image-post-thumbnail-widget.jpg\';
  if ( has_post_thumbnail() ) {
    //override  fallback image if post has any thumbnail
    $thumb = get_the_post_thumbnail_url();
  }

 $html .= \'<div class="recent_posts_widget_post">\';
 $html .= \'<a href=" \' . get_the_permalink() .\' "><div><img class="attachment-blogthumbhomewidget size-blogthumbhomewidget wp-post-image" src="\' .

$thumb

  . \'" alt="\' .get_the_title(). \' | \' .get_bloginfo(). \'"/></div></a>\';
 $html .= \'<a href=" \' . get_the_permalink() .\' "><h2 class="recent-posts-widget-title">\' . get_the_title() . \'</h2></a>\';
 $html .= \'<a href=" \' . get_the_permalink() .\' "><p class="recent-posts-widget-text">\' . excerpt(20) . \'</p></a>\';
 $html .= \'<div class="lees-meer-post-div"><a class="lees-meer-post-a" href=" \' . get_the_permalink() .\' "><span class="lees-meer-post-widget">Lees meer</span></a></div> \';
 $html .= "</div>";
endwhile; endif;

echo \'</div>\';

return $html;