At least the current version (1.0.7) uses
function bind($exchangeName, $routingKey[, $flags]);
(PECL amqp >= Unknown)
AMQPExchange::bind — The bind purpose
Bind an exchange to a queue using the specified routing key.
The name of the queue to which to bind.
The routing key to use as a binding.
Returns TRUE on success or FALSE on failure.
Throws AMQPExchangeException on failure.