Reply To: Add Image Size to another ACF Field

• neodjandre

• October 13, 2016 at 2:03 am

Hi thanks for this,

I am using

function my_acf_save_post( $post_id ) {

    // get image id
    $image = get_field('fl_image', $post_id);

    // set the thumbnail URL field key
    $thumbnail_url_field_key = 'fl_afeat';

    // set the value of the thumbnail URL field
    update_field($thumbnail_url_field_key, $image['sizes']['medium'], $post_id);

}

// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);

but nothing happens when I click on “Update Post”.

Both fields: fl_image and fl_afeat are image fields with the Image URL option set.

What would be wrong?