How to get strings from an array in PHP via WP-JSON?

Question

PHP

Hello! Wordpress Rest API comes with such an array, how to get specific values ​​of all 'guid' values ​​from this array? PHP uses the following code

register_rest_field( 'post', 'AttachedImages', array(
  'get_callback' => function ( $data ) {
    $postID = $data['id'];
    $attached_file = get_attached_media('',$postID);
    return $attached_file;
  }, ));