Yar_Server_Exception::getType

//Server.php
<?php
class Custom_Exception extends Exception {};

class API {
    public function throw_exception($name) {
        throw new Custom_Exception($name);
    }
}

$service = new Yar_Server(new API());
$service->handle();
?>

//Client.php
<?php
$client = new Yar_Client("http://host/api.php");

try {
    $client->throw_exception("client");
} catch (Yar_Server_Exception $e) {
    var_dump($e->getType());
    var_dump($e->getMessage());
}

The above example will output something similar to: