• wk

• October 14, 2018 at 5:43 pm

I was based on your reply and create something like that.

function filter_image_send_to_editor($html, $id, $caption, $title, $align, $url, $size, $alt) {
  $attr = get_field('CUSTOM FIELD NAME', $id);
  
  if ($attr !== NULL) {
    $html = str_replace('<img ', '<img data-attr="'. $attr .'" ', $html);
  }
  return $html;
}
add_filter('image_send_to_editor', 'filter_image_send_to_editor', 10, 8);

This solve my problem. Thanks again for help 🙂