Exclude the_post_thumbnail from gallery shortcode

I am using this code to have a simple gallery on the page:

<?php echo do_shortcode('[gallery itemtag="ul" icontag="li" size="full" columns="0" link="file" ]'); ?>

The problem now is that the end-user has to upload an image via the Media page before selecting this image as featured image.

I know this could be solved by adding the featured image's ID to the shortcode's exclude list, but how to get this ID automatically?


function exclude_thumbnail_from_gallery($null, $attr)
    if (!$thumbnail_ID = get_post_thumbnail_id())
        return $null; // no point carrying on if no thumbnail ID

    // temporarily remove the filter, otherwise endless loop!
    remove_filter('post_gallery', 'exclude_thumbnail_from_gallery');

    // pop in our excluded thumbnail
    if (!isset($attr['exclude']) || empty($attr['exclude']))
        $attr['exclude'] = array($thumbnail_ID);
    elseif (is_array($attr['exclude']))
        $attr['exclude'][] = $thumbnail_ID;

    // now manually invoke the shortcode handler
    $gallery = gallery_shortcode($attr);

    // add the filter back
    add_filter('post_gallery', 'exclude_thumbnail_from_gallery', 10, 2);

    // return output to the calling instance of gallery_shortcode()
    return $gallery;
add_filter('post_gallery', 'exclude_thumbnail_from_gallery', 10, 2);

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