#void pq\Connection::listenAsync(string $channel, callable $listener)

Asynchronously start listening on $channel for notifcations. See pq\Connection::listen().

Params:#

• string $channel#
  The channel to listen on.
• callable $listener# as function(string $channel, string $message#, int $pid#)
  A callback automatically called whenever a notification on $channel arrives.

Throws:#

• pq\Exception\InvalidArgumentException
• pq\Exception\BadMethodCallException
• pq\Exception\RuntimeException