PHP RabbitMQ Topic Mode

1.Pre-tutorial

Please read the following sections first to understand the relevant knowledge

• RabbitMQ Basic Concepts
• Principle of RabbitMQ Topic Pattern
• PHP RabbitMQ Quick Start Chapter (required, because subsequent chapters will not duplicate the code, only show the key code)
• PHP RabbitMQ Publish/Subscribe Pattern Chapter (required, because the code is almost the same, only the exchange type and routing parameters are different)

2.Define Topic Exchange

// Declare the exchange
$channel->exchange_declare(
    'tizi365.topic', // Exchange name, needs to be unique, cannot be repeated
    'topic', // Exchange type
    false,
    false, // Whether it is durable
    false
);

Note: Both message producers and consumers need exchanges.

3.Send Message

We send messages to the exchange, and the exchange delivers the messages to the corresponding queue based on the routing rules.

<?php

require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

// Create a rabbitmq connection
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
// Create Channel
$channel = $connection->channel();

// Declare the exchange
$channel->exchange_declare(
    'tizi365.topic', // Exchange name, needs to be unique, cannot be repeated
    'topic', // Exchange type
    false,
    false, // Whether it is durable
    false
);


// Message object, the parameter is the message content
$msg = new AMQPMessage("hello tizi365.com");

// Send message
// Note the third parameter, the routing parameter
$channel->basic_publish(
    $msg, // Message object
    'tizi365.topic', // Exchange name
    "www.tizi365.com" // Routing parameter, can be arbitrarily defined according to requirements
);

echo ' [x] Sent ', $msg->getBody(), "\n";

// Release resources
$channel->close();
$connection->close();

4.Receive Message

4.1.Define Queue & Bind Exchange

To consume queue messages, you need to define a queue first, and then bind the queue to the target exchange.

// Declare an anonymous queue
list($queue_name, ,) = $channel->queue_declare("", false, false, true, false);

// Bind the queue to the specified exchange
$channel->queue_bind(
    $queue_name, // Queue name
    'tizi365.topic', // Exchange name
    "*.tizi365.com" // Bind routing parameter, here using wildcard * (asterisk), which can match a single word

Note: The set routing parameters all use the * (asterisk) wildcard, which can match a single word. If changed to # (hash), it can match multiple words.

<?php
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;

// Create a rabbitmq connection
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
// Create a Channel
$channel = $connection->channel();

// Declare an exchange
$channel->exchange_declare(
    'tizi365.topic', // Exchange name, needs to be unique and cannot be repeated
    'topic', // Exchange type
    false,
    false, // Whether it is durable
    false
);

// Declare an anonymous queue
list($queue_name, ,) = $channel->queue_declare("", false, false, true, false);

// Bind the queue to the specified exchange
$channel->queue_bind(
    $queue_name, // Queue name
    'tizi365.topic', // Exchange name
    "*.tizi365.com" // Binding routing key, using wildcard * here, which can match a single word
);

echo " [*] Waiting for message. To exit press CTRL+C\n";

// Define the message handling function (using an anonymous function here)
$callback = function ($msg) {
    // Message processing logic
    echo ' [x] ', $msg->body, "\n";
};

// Create a consumer
$channel->basic_consume(
    $queue_name, // Queue name to consume from
    '', // Consumer tag, if ignored, a unique ID will be generated automatically
    false,
    true, // Whether to automatically acknowledge the message, i.e., automatically tell rabbitmq that the message has been processed successfully
    false,
    false,
    $callback // Message handling function
);

// If the channel is not closed, keep blocking the process to avoid process exit
while ($channel->is_open()) {
    $channel->wait();
}

// Release resources
$channel->close();
$connection->close();

Because the routing parameter set when binding the exchange is *.tizi365.com, it matches the routing parameter of the message (www.tizi365.com), so the message can be received.