媒体上载程序将图像和标题包装在[caption] 短代码。有一个名为img_caption_shortcode 那可以做你想做的事。标题本身作为数组的一部分传递给短代码处理程序，图像id也是这样。

add_filter( \'img_caption_shortcode\', \'wwm_img_caption_filter\', 10, 3 );

function wwm_img_caption_filter( $empty, $attr, $content )
{

  $image_id = $attr[\'id\'];
  //do some checking of the $image_id (attachment id) to see what it links to
  //if it links to amazon, include the link in the caption:
  if ( /*my condition is met*/ ) {

   $attr[\'caption\'] = ;//modify the string appropriately
  }

  return ;//some string - see documentation
}

使现代化**

如果所讨论的图像没有标题，请使用\\u内容过滤器

add_filter( \'the_content\', \'add_affiliate_link_caption\' );

function add_affiliate_link_caption( $content )
{

 //I\'m not even going to try a regex...
 //but some sort of regex find/replace stuff on $content

 return $content;
}