Reply To: Programmatically Inserting Photos Into ACF Gallery Field, But….

• John Huebner

• February 14, 2016 at 12:39 am

A gallery field in ACF stores an array of image IDs. I believe that the following line overwrites what’s stored with the new value each time.

update_field("field_5693402ab8561", $attach_id, $post[0]->ID );

You will need to get what’s already in the field, append the new image to the array and then update it. Something like this might work.

$array = get_field('field_5693402ab8561', $post[0]->ID, false);
if (!is_array($array)) {
  $array = array();
}
$array[] = $attach_id;
update_field('field_5693402ab8561', $array, $post[0]->ID );