我正在为我的自定义帖子类型创建自定义端点，以删除不必要的字段并加快请求速度。我想从我的自定义帖子类型中获取图像url。请检查代码以了解更多信息。我无法获取图像字段。在这个link, 这是我在默认rest api调用中得到的，这是我在自定义端点**（top\\u image的image url）**上想要的。请检查我使用和获取空数据的方法。我哪里做错了？请帮帮我。

以下是我的Rest api代码：

function digital_digievent() {
$args = [
    \'numberposts\' => 99999,
    \'post_type\' => \'digievent\'
];

$posts = get_posts($args);

$data = [];
$i = 0;

foreach($posts as $post) {
    $data[$i][\'id\'] = $post->ID;
    $data[$i][\'EventTitle\'] = $post->post_title;
    $data[$i][\'EventOrganizeBy\'] = $post->organize_by;
    $data[$i][\'EventPlace\'] = $post->event_place;
    $data[$i][\'EventDate\'] = $post->event_date;
    $data[$i][\'EventTime\'] = $post->event_time;
    $data[$i][\'EventContent\'] = apply_filters( \'the_content\', $post->post_content );
    $data[$i][\'EventExcerpt\'] = $post->post_excerpt;
    $data[$i][\'Slug\'] = $post->post_name;
    $data[$i][\'EventLink\'] = get_the_permalink($post->ID);
    $data[$i][\'EventDate\'] = $post->post_date;
    $data[$i][\'EventGuid\'] = $post->guid;
    $data[$i][\'EventFeaturedImage\'][\'thumbnail\'] = get_the_post_thumbnail_url($post->ID, \'thumbnail\');
    $data[$i][\'EventFeaturedImage\'][\'medium\'] = get_the_post_thumbnail_url($post->ID, \'medium\');
    $data[$i][\'EventFeaturedImage\'][\'large\'] = get_the_post_thumbnail_url($post->ID, \'large\');
    $data[$i][\'top_image\'] = $post->ad_1[0][\'top_image\'];


    $i++;
}

return $data;

add\\u action（\'rest\\u api\\u init\'，function（）{register\\u rest\\u route（\'myrestapi/v1\'，\'digievent\'，[\'methods\'=>\'GET\'，\'callback\'=>\'digital\\u digievent\'，]）；

})；

What I want is the image url(guid) of both top_image and bottom_image field for ad_1.