wordpress get_the_post_thumbnail（）没有显示任何内容

问题描述：

I'm creating my first wordpress theme, I can't figure out why the post thumbnails aren't showing. it just does nothing(no errors). Here is my code:

<?php
    $args = array( 'posts_per_page' => 3, 'category' => 6);
    $postslist = get_posts( $args );
    foreach ( $postslist as $post ) :
      setup_postdata( $post );
    ?>
      <div class="col-xs-12 col-sm-4">
        <h4><?php the_title(); ?></h4>
        <?php get_the_post_thumbnail('small'); ?>
        <p><?php the_excerpt(); ?></p>
      </div>      

    <?php
    endforeach; 
    wp_reset_postdata();
  ?>

I'm using HTML5Blank Theme. And it supports thumbnails. this is the code for it in my functions.php file:

add_theme_support('post-thumbnails');
add_image_size('large', 700, '', true);
add_image_size('medium', 250, '', true);
add_image_size('small', 120, '', true);
add_image_size('custom-size', 700, 200, true);

我正在创建我的第一个wordpress主题，我无法弄清楚为什么帖子缩略图没有显示。它什么都不做（没有错误）。这是我的代码： p>

 ＆lt;？php 
 $ args = array（'posts_per_page'=＆gt; 3，'category'=＆gt; 6）; 
 $  postslist = get_posts（$ args）; 
 foreach（$ postslist as $ post）：
 setup_postdata（$ post）; 
？＆gt; 
＆lt; div class =“col-xs-12 col-sm-4  “＆gt; 
＆lt; h4＆gt;＆lt;？php the_title（）;  ？＆gt;＆lt; / h4＆gt; 
＆lt;？php get_the_post_thumbnail（'small'）;  ？＆gt; 
＆lt; p＆gt;＆lt;？php the_excerpt（）;  ？＆gt;＆lt; / p＆gt; 
＆lt; / div＆gt;  
 
＆lt;？php 
 endforeach;  
 wp_reset_postdata（）; 
？＆gt; 
  code>  pre> 
 
 我正在使用HTML5Blank主题。 它支持缩略图。 这是我在functions.php文件中的代码： p> 
 
 
  add_theme_support（'post-thumbnails'）; 
add_image_size（'large'，700，''，true）  ; 
add_image_size（'medium'，250，''，true）; 
add_image_size（'small'，120，''，true）; 
add_image_size（'custom-size'，700,200，true）; 
   pre> 
  div>

答

You need to echo it like this echo get_the_post_thumbnail('small');
get_ functions store the data, they don't actually return it which is why you have to echo. They are useful in many cases like you could store it in a variable like $thumb-small = get_the_post_thumbnail('small'); and reuse it throughout the page.

答

I think this is a small typing error: samll -> small

答

the the_post_thumbnail function also used for get post image you can also do by this way.

<?php 
 if ( has_post_thumbnail() ) {
       the_post_thumbnail('small');
 }

?>

wordpress get_the_post_thumbnail（）没有显示任何内容

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