Twitch API Get Followers

I have one more question. How can I just get display_name in response? I don’t want identity, species and others to appear. I just want display_name to appear
Code: <?php
$headers = array(
‘Accept: application/vnd.twitchtv.v5+json’,
‘Authorization: OAuth key’,
);

$url = ‘https://api.twitch.tv/kraken/users/user-id’;

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 3);

$result = curl_exec($ch);
curl_close($ch);

echo $result;
?>

Response: https://imgur.com/BjMNqCP