Profile: francescoG-3

// Put the code of your snippet below this comment.
function wp_get_image_ids() {
    $image_urls = get_post_meta( get_the_ID(),'wpcf-galleria-evento');
    $id_list = array();
     foreach ($image_urls as $image_url) {
         if(!empty($image_url)){
                 $attachment = attachment_url_to_postid($image_url);
                 array_push($id_list, $attachment);
             }
            }
 return implode(",", $id_list); 
}
add_shortcode( 'wp_get_image_ids', 'wp_get_image_ids' );