I am trying to show thumbnail image as an attachment in the feed. So I use following code.

function add_images_to_rss($var) {
    global $post;
    if(has_post_thumbnail($post->ID)) {     
        $tid = get_post_thumbnail_id( $post->ID);
        //$thumb = wp_get_attachment_image_src($tid, 'large');      
        $thumb = wp_get_attachment_image_src($tid, '100x100');  
        $thumb_meta = wp_get_attachment_metadata($tid);
        $up = wp_upload_dir();
        print '<enclosure type="'.get_post_mime_type($tid).'" length="'.filesize($up['basedir'].'/'.$thumb_meta['file']).'" url="'.$thumb[0].'" />';

But it shows larger size images as attachment. It suppose to show 100x100 size attachments only. What I am doing wrong ?

How can I show 100x100 image size attachemnts in that feed?

site is : http://www.supgower.com/feed/

1 Answer 1


You are using the size parameter of wp_get_attachment_image_src in a wrong format. This parameter can be:

  • A string: keyword of the image size; thumbnail, medium, large, full or any other custom size previously registered).
  • A 2-items array representing the width and height; for example, array( 100, 100 ).

So, you have to change this:

$thumb = wp_get_attachment_image_src($tid, '100x100'); 


$thumb = wp_get_attachment_image_src( $tid, array(100,100) );

And this should also work for thumbnail size:

$thumb = wp_get_attachment_image_src( $tid, 'thumbnail' );

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