我使用以下代码在我的主页上显示帖子。

但我无法打印thumbnails 使用get_the_post_thumbnail($post->ID, \'thumbnail\');

如果您能帮助解决此问题，我们将不胜感激。。

while (have_posts()) : the_post();
                $excerpt = get_the_excerpt();   
                $date = explode(",", get_the_time("F,j,Y", "", "", false));
                print(\' 
                    <section class="large-4 columns">
                    <section class="main_post cbox1">
                    <section class="post_inner row collapse">\');             
                    print(\'<div class="large-2 columns small-2">
                                <span class="date_format">
                                    <span class="date_num">\' . $date[1] . \'
                                    </span><br/><span class="date_month">\' . substr($date[0], 0, 3) . \'
                                    </span></span></span>
                                </span>
                            </div>\');
                    print (\'<div class="large-10 columns small-10">\');
                            the_title(\'<a class="blogroll_title" href="\' . get_permalink() . \'"><h1 class="heading_blog">\', \'</h1></a>\');
                    print (\'</div>\');                                   
                    print (\'<!--end post_inner --></section>\');
                    print (\'<div class="row collapse post_content"><p>\');
                        if (strlen(get_the_content()) > 100) {
                            $content = get_the_content();
                            echo str_replace(\'&nbsp;\', \'<br /><br />\', substr($content, 0, 300)). "....";   
                            echo \'</p><a href=" \' . get_permalink() . \' " class="read_more button button_top button_body_col11 button_radius">Read More</a>\';
                            echo get_the_post_thumbnail($post->ID, \'thumbnail\'); // post image thumbanails
                        }
                        else { the_content(); echo "</p>"; }