تبدیل اطلاعات Json

[T.Toosi]

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

$json = file_get_contents('http://api.soundcloud.com/users/royaloperahouse/tracks/?client_id=3a4dd5ec3c85a6611d1672d828d835ce&tags=mohsen%20chavoshi');
$obj = json_decode($json);
foreach ($obj as $k) {        
echo $k->uri;

}