Publish Message to MQTT Broker using PHP

php-mqtt/client library

1. Add php-mqtt/client library to composer.json file:

"require": {
    "php-mqtt/client": "^1.1"
}

2. Install library from the command line:

composer install

3. Publish message to MQTT broker:

<?php

use PhpMqtt\Client\ConnectionSettings;
use PhpMqtt\Client\MqttClient;

require_once __DIR__.'/vendor/autoload.php';

const MQTT_HOST = '192.168.0.174';
const MQTT_PORT = 1883;
const MQTT_CLIENT_ID = 'PHP-MQTT-client';
const MQTT_USER = 'YOUR MQTT USER';
const MQTT_PASSWORD = 'YOUR MQTT USER PASSWORD';
const TOPIC = 'php/test';

$client = new MqttClient(MQTT_HOST, MQTT_PORT, MQTT_CLIENT_ID);

$settings = (new ConnectionSettings)
    ->setUsername(MQTT_USER)
    ->setPassword(MQTT_PASSWORD);
$client->connect($settings, true);

$data = 'Hello';
$client->publish(TOPIC, $data);