Call to undefined method AMQPChannel::is_open()

[vol4ikman]

Code:
$connection = new PhpAmqpLib\Connection\AMQPSSLConnection( $host, $port, $user, $password, $vhost = '/', $ssl_opts); $channel = $connection->channel(); $channel->queue_declare('reply-queue', false, true, false, false); echo " [*] Waiting for messages..."; $callback = function ($reply_msg) { echo ' [x] Received ', $reply_msg->body, "\n"; }; $channel->basic_consume('reply-queue', '', false, true, false, false, $callback); while ($channel->is_open()) { $channel->wait(); } $channel->close(); $connection->close();

Error:

Fatal error: Uncaught Error: Call to undefined method PhpAmqpLib\Channel\AMQPChannel::is_open()

[vol4ikman]

Accodring to this tutorial:

https://github.com/rabbitmq/rabbitmq-tutorials/blob/main/php/receive.php

What am I doing wrong?