Description:
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There should be a way to get the queue name from an AMQPQueue 
object after a declare. This is because, if declare is called 
with an empty string for queue name, then the server creates 
an auto-generated queue name. This is very useful for RPC in 
amqp. But, currently, there is no way to get the queue name 
from a queue object, only set it. 

Reproduce code:
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$conn = new \AMQPConnection();
$conn->connect();

$ex = new \AMQPExchange($conn);
$ex->declare('rpc_reply_queues', AMQP_EX_TYPE_DIRECT, AMQP_DURABLE);

$q = new \AMQPQueue($conn);

$q->declare('', AMQP_AUTODELETE | AMQP_EXCLUSIVE);

$queueName = ""; // this is where we need to be able to get the queue name

$ex->bind($queueName, $queueName);

// while we are sleeping, go run list_queues on your management console in your amqp server, you will see at least one amq.gen- (or something similar) queue(s)
sleep(60);
exit;

Expected result:
----------------
I expect it to generate an auto-named queue on the server, 
which it does. I would then like a way to get the name of that 
queue from the $q object so I can set the $queueName variable.

Actual result:
--------------
There is no way to get the queue name from the $q object.