/** Die Klasse einbinden **/
require_once("TwitterAPIExchange.php"); 

/** Hier kommen die Codes der APP rein **/ 
$settings = array(
     'oauth_access_token' => "xxx",
    'oauth_access_token_secret' => "xxx",
    'consumer_key' => "xxx",
    'consumer_secret' => "xxx"
);

/** Perform a GET request and echo the response **/
/** Note: Set the GET field BEFORE calling buildOauth(); **/
$url = 'https://api.twitter.com/1.1/users/lookup.json';
$getfield = '?screen_name=[Twitter-User-Name]&count=1';
$requestMethod = 'GET';
$twitter = new TwitterAPIExchange($settings);
$response = $twitter->setGetfield($getfield)
             ->buildOauth($url, $requestMethod)
             ->performRequest();

$result=json_decode($response, true);
echo "<img src=\"".$result[0]['profile_image_url']."\" />
";
echo "Follower: ".$result[0]['followers_count']."
";
echo "Folgt: ".$result[0]['friends_count']."
";
echo "Tweets: ".$result[0]['statuses_count'];