我正在使用Multipostthumbnails插件-https://wordpress.org/plugins/multiple-post-thumbnails/

它有一个特定的命名约定。如果没有特征图像集，我知道输出占位符的常用方法，但不使用它们的代码？

我当然想要-

if ( has_post_thumbnail($post->ID) ){   
$image = wp_get_attachment_image_src(get_post_thumbnail_id(), \'news-large\');
$image = $image[0];
echo \'<img src="\'.$image.\'" alt="" />\';
} else {  
$image = get_template_directory_uri() .\'/assets/img/placeholders/placeholder.png\'; 
echo \'<img src="\'.$image.\'" alt="" />\';
}

但他们现有的显示特色图像的代码是-

if (class_exists( \'MultiPostThumbnails\' )) : MultiPostThumbnails::the_post_thumbnail(get_post_type(), \'header-image\', NULL, \'header-image-full\', array(\'class\' => "custom-header-image") ); endif;

只是看不到如何调整它以适应顶部的代码？

对于博客页面-

标准代码-

if (class_exists( \'MultiPostThumbnails\' )) : MultiPostThumbnails::the_post_thumbnail( \'page\', \'header-image\', get_option(\'page_for_posts\'), \'header-image-full\', array(\'class\' => "custom-header-image") ); endif;

我尝试显示占位符-

if ( class_exists( \'MultiPostThumbnails\' ) ) { 
                        MultiPostThumbnails::the_post_thumbnail( \'page\', \'header-image\',     get_option(\'page_for_posts\'),
                            \'header-image-full\', 
                            array(\'class\' => "custom-header-image") ); 

                        } else {  
                            $image = get_template_directory_uri() .\'/assets/img/placeholders/header_placeholder.png\'; 
                            echo \'<img src="\'.$image.\'" alt="" />\';
                        }

非常感谢

if ( class_exists( \'MultiPostThumbnails\' ) && 
     ( MultiPostThumbnails::has_post_thumbnail( get_post_type(), \'header-image\' , get_the_ID() ) ) ) { 
       MultiPostThumbnails::the_post_thumbnail(get_post_type(), \'header-image\', NULL, 
                          \'header-image-full\', 
                           array(\'class\' => "custom-header-image") ); 

} else {  
  $image = get_template_directory_uri() .\'/assets/img/placeholders/placeholder.png\'; 
  echo \'<img src="\'.$image.\'" alt="" />\';
}

MultiPostThumbnails::has_post_thumbnail(
    $post_type,
    $id,
    $post_id = null
)