PHP extension library comparison and performance test analysis of MQTT protocol

PHP extension library comparison and performance test analysis of MQTT protocol

Abstract:
With the rapid development of the Internet of Things, the MQTT protocol as a lightweight message transmission protocol is widely used in the Internet of Things Communication between devices. In the PHP field, in order to facilitate PHP developers to use the MQTT protocol, multiple MQTT PHP extension libraries have also emerged. This article will compare and perform performance test analysis of the current mainstream PHP extension libraries of the MQTT protocol, so as to choose the PHP extension library of the MQTT protocol that is suitable for your own project.

Keywords:
MQTT protocol, PHP extension library, comparison, performance test, code example

1. Introduction to MQTT protocol
MQTT protocol (Message Queuing Telemetry Transport) is a A lightweight publish/subscribe communication protocol that is simple, easy to implement, and has low overhead. The MQTT protocol is widely used in communication between IoT devices, such as sensor networks, smart homes, Internet of Vehicles and other fields.

2. Comparison of MQTT PHP extension libraries
In the PHP field, in order to facilitate PHP developers to use the MQTT protocol, multiple MQTT PHP extension libraries can be selected, such as phpMQTT, mosquitto-php, etc. The following is a comparison and performance test of the PHP extension libraries of these mainstream MQTT protocols.

1. phpMQTT extension library
   phpMQTT is an open source PHP MQTT client library that supports functions such as publishing messages, subscribing messages, disconnecting, etc., and has good portability.

Sample code:

<?php
require("phpMQTT.php");

$mqtt = new phpMQTT("localhost", 1883, "ClientID");

if ($mqtt->connect()) {
   $mqtt->publish("topic", "Hello World!", 0);
   $mqtt->close();
}
?>

2. mosquitto-php extension library
   mosquitto-php is a PHP extension based on the Mosquitto library, providing complete support for the MQTT protocol , including functions such as publishing messages, subscribing messages, and authentication.

Sample code:

<?php
$mqtt = new MosquittoClient();
$mqtt->connect("localhost", 1883, 60);

$mqtt->loop();

$mqtt->publish("topic", "Hello World!", 0, false);

$mqtt->disconnect();
?>

3. Performance test analysis
In order to compare the performance of the PHP extension libraries of these two MQTT protocols, we conducted a series of performance tests. The test environment is a virtual machine with 4 cores and 8G memory, and JMeter is used to test the concurrent performance of the two extension libraries.

The test results are shown in the following table:

Based on the above comparison and performance test analysis, we can draw the following conclusions:

For simple MQTT communication requirements, you can choose the phpMQTT extension library. It is easy to use and has good portability.
• For MQTT communication requirements with large concurrency and high performance requirements, you can choose the mosquitto-php extension library, which has better performance and stability.

[phpMQTT official documentation](https://github.com/bluerhinos/phpMQTT)
• [mosquitto-php official documentation]( https://mosquitto-php.readthedocs.io)

[phpMQTT download address](https: //github.com/bluerhinos/phpMQTT)
• [mosquitto-php download address](https://pecl.php.net/package/mosquitto)

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