For single posts and pages, I would like to add certain rel
attributes to all the images on the contained therein added with the “Add Image” functionality on the edit screen.
The attribute would be rel="lightbox[post id]"
What function would I filter to accomplish this most effectively?
2 Answers
image_send_to_editor
function insert_img_rel_attrib( $html, $id, $caption, $title, $align, $url, $size, $alt )
{
/* Run your magic on the image $html to insert rel attrib */
return $html;
}
add_filter( 'image_send_to_editor', 'insert_img_rel_attrib' );