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

Listen on $channel for notifications. See pq\Connection::unlisten().

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

Example:#

<?php

$conn = new pq\Connection;
$conn->listen("queue", function($channel, $message, $backend_pid) {
    printf("Connection on backend %d said %s\n", $backend_pid, $message);
});

?>