<?php
require 'pusher/pusher-http-php-master/lib/Pusher.php';

$options = [
    'cluster' => 'your_cluster',
    'useTLS' => true
];
$pusher = new Pusher\Pusher(
    'your_app_key',
    'your_app_secret',
    'your_app_id',
    $options
);

$data['message'] = 'hello world';
$pusher->trigger('my-channel', 'my-event', $data);