$url        = 'http://www.decredpool.org/index.php?page=api&action=getuserstatus&api_key=eb8aeaab3889cfe4af42f51c29730ffa294565682fc194ef3afe273411a9a0ee&id=3034';
$data       = json_decode(file_get_contents($url));

$stats      = $data['getuserstats']['data'];
$username   = $stats['username'];
$shares     = $stats['shares'];
//wat is mis met $shares['invalid'] te gebruiken?
$hash       = $stats['hashrate'];