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Informations about the package php-amqplib

php-amqplib

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This library is a pure PHP implementation of the AMQP 0-9-1 protocol. It's been tested against RabbitMQ.

The library was used for the PHP examples of RabbitMQ in Action and the official RabbitMQ tutorials.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

Project Maintainers

Thanks to videlalvaro and postalservice14 for creating php-amqplib.

The package is now maintained by Ramūnas Dronga, Luke Bakken and several VMware engineers working on RabbitMQ.

Supported RabbitMQ Versions

Starting with version 2.0 this library uses AMQP 0.9.1 by default and thus requires RabbitMQ 2.0 or later version. Usually server upgrades do not require any application code changes since the protocol changes very infrequently but please conduct your own testing before upgrading.

Supported RabbitMQ Extensions

Since the library uses AMQP 0.9.1 we added support for the following RabbitMQ extensions:

Extensions that modify existing methods like alternate exchanges are also supported.

Related libraries

Setup

Ensure you have composer installed, then run the following command:

That will fetch the library and its dependencies inside your vendor folder. Then you can add the following to your .php files in order to use the library

Then you need to use the relevant classes, for example:

Usage

With RabbitMQ running open two Terminals and on the first one execute the following commands to start the consumer:

Then on the other Terminal do:

You should see the message arriving to the process on the other Terminal

Then to stop the consumer, send to it the quit message:

If you need to listen to the sockets used to connect to RabbitMQ then see the example in the non blocking consumer.

Change log

Please see CHANGELOG for more information what has changed recently.

API Documentation

http://php-amqplib.github.io/php-amqplib/

Tutorials

To not repeat ourselves, if you want to learn more about this library, please refer to the official RabbitMQ tutorials.

More Examples

Multiple hosts connections

If you have a cluster of multiple nodes to which your application can connect, you can start a connection with an array of hosts. To do that you should use the create_connection static method.

For example:

This code will try to connect to HOST1 first, and connect to HOST2 if the first connection fails. The method returns a connection object for the first successful connection. Should all connections fail it will throw the exception from the last connection attempt.

See demo/amqp_connect_multiple_hosts.php for more examples.

Batch Publishing

Let's say you have a process that generates a bunch of messages that are going to be published to the same exchange using the same routing_key and options like mandatory. Then you could make use of the batch_basic_publish library feature. You can batch messages like this:

and then send the batch like this:

When do we publish the message batch?

Let's say our program needs to read from a file and then publish one message per line. Depending on the message size, you will have to decide when it's better to send the batch. You could send it every 50 messages, or every hundred. That's up to you.

Optimized Message Publishing

Another way to speed up your message publishing is by reusing the AMQPMessage message instances. You can create your new message like this:

Now let's say that while you want to change the message body for future messages, you will keep the same properties, that is, your messages will still be text/plain and the delivery_mode will still be AMQPMessage::DELIVERY_MODE_PERSISTENT. If you create a new AMQPMessage instance for every published message, then those properties would have to be re-encoded in the AMQP binary format. You could avoid all that by just reusing the AMQPMessage and then resetting the message body like this:

Truncating Large Messages

AMQP imposes no limit on the size of messages; if a very large message is received by a consumer, PHP's memory limit may be reached within the library before the callback passed to basic_consume is called.

To avoid this, you can call the method AMQPChannel::setBodySizeLimit(int $bytes) on your Channel instance. Body sizes exceeding this limit will be truncated, and delivered to your callback with a AMQPMessage::$is_truncated flag set to true. The property AMQPMessage::$body_size will reflect the true body size of a received message, which will be higher than strlen(AMQPMessage::getBody()) if the message has been truncated.

Note that all data above the limit is read from the AMQP Channel and immediately discarded, so there is no way to retrieve it within your callback. If you have another consumer which can handle messages with larger payloads, you can use basic_reject or basic_nack to tell the server (which still has a complete copy) to forward it to a Dead Letter Exchange.

By default, no truncation will occur. To disable truncation on a Channel that has had it enabled, pass 0 (or null) to AMQPChannel::setBodySizeLimit().

Connection recovery

Some RabbitMQ clients using automated connection recovery mechanisms to reconnect and recover channels and consumers in case of network errors.

Since this client is using a single-thread, you can set up connection recovery using exception handling mechanism.

Exceptions which might be thrown in case of connection errors:

Some other exceptions might be thrown, but connection can still be there. It's always a good idea to clean up an old connection when handling an exception before reconnecting.

For example, if you want to set up a recovering connection:

A full example is in demo/connection_recovery_consume.php.

This code will reconnect and retry the application code every time the exception occurs. Some exceptions can still be thrown and should not be handled as a part of reconnection process, because they might be application errors.

This approach makes sense mostly for consumer applications, producers will require some additional application code to avoid publishing the same message multiple times.

This was a simplest example, in a real-life application you might want to control retr count and maybe gracefully degrade wait time to reconnection.

You can find a more excessive example in #444

UNIX Signals

If you have installed PCNTL extension dispatching of signal will be handled when consumer is not processing message.

To disable this feature just define constant AMQP_WITHOUT_SIGNALS as true

Signal-based Heartbeat

If you have installed PCNTL extension and are using PHP 7.1 or greater, you can register a signal-based heartbeat sender.

Debugging

If you want to know what's going on at a protocol level then add the following constant to your code:

Benchmarks

To run the publishing/consume benchmark type:

Tests

To successfully run the tests you need to first have a stock RabbitMQ broker running locally.Then, run tests like this:

Contributing

Please see CONTRIBUTING for details.

Using AMQP 0.8

If you still want to use the old version of the protocol then you can do it by setting the following constant in your configuration code:

The default value is '0.9.1'.

Providing your own autoloader

If for some reason you don't want to use composer, then you need to have an autoloader in place fo the library classes. People have reported to use this autoloader with success.

Original README:

Below is the original README file content. Credits goes to the original authors.

PHP library implementing Advanced Message Queuing Protocol (AMQP).

The library is port of python code of py-amqplib http://barryp.org/software/py-amqplib/

It have been tested with RabbitMQ server.

Project home page: http://code.google.com/p/php-amqplib/

For discussion, please join the group:

http://groups.google.com/group/php-amqplib-devel

For bug reports, please use bug tracking system at the project page.

Patches are very welcome!

Author: Vadim Zaliva [email protected]


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