Aggregating Users and Topics in Klout

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<?php

$user = $_GET["user"];
$key= YOUR_KLOUT_KEY;
$response = array('user' => $user);

$topicUrl = "http://api.klout.com/1/users/topics.json?users=$user&key=$key";

$json = file_get_contents($topicUrl,0,null,null);
$topics = json_decode($json);
$i = 0;
$response['topics'] = $topics->users[0]->topics;

$inflUrl = "http://api.klout.com/1/soi/influenced_by.json?users=$user&key=$key";

$json = file_get_contents($inflUrl, 0, null, null);
$friends = json_decode($json);
$friendArray = array();
foreach($friends->users[0]->influencers as $friend) {
        array_push($friendArray, $friend->twitter_screen_name); 
}

$user = implode($friendArray, ',');
$topicUrl = "http://api.klout.com/1/users/topics.json?users=$user&key=$key";
$json = file_get_contents($topicUrl, 0, null, null);
$topics = json_decode($json);
$i = 0;
foreach($topics->users as $user) {
        $response['influencers'][$i] = $user;                   
        $i++;
}

print_r(json_encode($response));
?>