Getting an image from a facebook post on a public page - php

Question

I'm trying to show a facebook feed on my website, which is working. But I only managed to show the text of the post, not the image attached to it (or if possible, if there are multiple images, only the first one or biggest one).
I tried looking here for the correct name to get it using the API
This is my code now (which shows facebook posts in an owl carousel):
function fetchUrl($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 20);
// You may need to add the line below
// curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
$feedData = curl_exec($ch);
curl_close($ch);
return $feedData;
}
//App Info, needed for Auth
$app_id = "1230330267012270";
$app_secret = "secret";
//Retrieve auth token
$authToken = fetchUrl("https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id=1230330267012270&client_secret=secret");
$json_object = fetchUrl("https://graph.facebook.com/267007566742236/feed?{$authToken}");
$feedarray = json_decode($json_object);
foreach ( $feedarray->data as $feed_data )
{
if($feed_data->message != ''){
$facebookfeed .= '
<div class="item">
<div class="product-item">
<img class="img-responsive" src="images/siteimages/imgfacebook.jpg" alt="">
<h4 class="product-title">'.$feed_data->name.'</h4>
<p class="product-desc">'.$feed_data->message.'</p>
<p>'.$feed_data->story.'</p>
<img src="'.$feed_data->picture.'">
<p>Lees meer</p>
</div><!-- Product item end -->
</div><!-- Item 1 end -->';
}
}
echo $facebookfeed;
Looking at the Facebook documentation I thought $feed_data->picture would work, but it returns nothing.

Answer 1

To try to improve performance on mobile networks, Nodes and Edges in v2.4 requires that you explicitly request the field(s) you need for your GET requests. For example, GET /v2.4/me/feed no longer includes likes and comments by default, but GET /v2.4/me/feed?fields=comments,likes will return the data.
Source: https://developers.facebook.com/docs/apps/changelog#v2_4