Dfyjkt

I try parse Search Twitter API results. ID,Nick name, status message etc. - with this all stuff are all ok. But when i try echo hastags or media url i catch null value but in in json i have a data.
My working code:
$twitter = new TwitterAPIExchange($settings);

$string = json_decode($twitter->setGetfield($getfield)
->buildOauth($url, $requestMethod)
->performRequest(),true);

foreach($string['statuses'] as $tweets) {
 $time = $tweets['created_at'];
 $id = $tweets['id'];
 $source = $tweets['source'];
 $tweet = $tweets['full_text'];
 $name = $tweets['user']['name'];
 $user = $tweets['user']['screen_name'];
 $profile_image = $tweets['user']['profile_image_url'];
 $followers = $tweets['user']['followers_count'];
 $friends = $tweets['user']['friends_count'];
 $listed = $tweets['user']['listed_count'];
$hashtag = $tweets['media']['media_url'];
echo "Time and Date of Tweet: " . $time ."<br />";
 echo "ID of Tweet: " . $id . "<br />";
 echo "Source of Tweet: " . $source . "<br />";
 echo "Tweet: ". $tweet ."<br />";
 echo "Tweeted by: ". $name ."<br />";
 echo "Screen name: ". $user ."<br />";
 echo "<a href="http://twitter.com/$user">@$user</a><br />";
 echo "<img src="".$profile_image."" width="100px" height="100px" /><br />";
 echo "Followers: ". $followers ."<br />";
 echo "Friends: ". $friends ."<br />";
 echo "Listed: ". $listed ."<br /><hr />";

here piace of json output (var_dump $string)

 string(46) "http://pbs.twimg.com/media/DrvSmRIWkAEDLMv.jpg"
 ["media_url_https"]=>
 string(47) "https://pbs.twimg.com/media/DrvSmRIWkAEDLMv.jpg"
 ["url"]=>
 string(23) "https://"
 ["display_url"]=>
 string(26) "pic.twitter.com/r7nAHcjEpA"
 ["expanded_url"]=>
 string(65) "https://twitter.com/KolaSokol1/status/1061673709738565634/photo/1"
 ["type"]=>
 string(5) "photo"
 ["sizes"]=>

As i see i have data at media_url, but when i try

$hashtag = $tweets['media']['media_url'];
 echo "hashtags: ". $hashtags ."<br /><hr />";

I get nothing.

Also when i try do

echo "<pre>";
echo var_dump($tweets['media']['media_url']);
echo "</pre>";

I get NULL.
I am really bad in php, please give me advise, what i'am missing? Thank you for advice.

Its work if do parse like this

 foreach ($string['statuses'] as $tweets) 
 echo $tweets['entities']['hashtags']['0']['text']."<hr />";