Example program using slack-client

slack-example.php

<?php
require __DIR__ . "/vendor/autoload.php";

use React\EventLoop;
use Slack\ChannelInterface;
use Slack\RealTimeClient;


$loop = EventLoop\Factory::create();

$client = new RealTimeClient($loop);
$client->setToken("some token");

// Wait for a user to type a message.
$client->on("message", function ($data) use ($client) {
    // Look for certain text. The array contains keys corresponding to the event
    // data documented in the Slack events API: https://api.slack.com/events
    if (strpos($data["text"], "bot respond") !== false) {
        // Asynchronously get whatever kind of channel the message was sent in.
        $client->getChannelGroupOrDMByID($data["channel"])->then(function (ChannelInterface $channel) use ($client) {
            // After the channel object was fetched, we can continue.

            // Send a message to the same channel the original message was posted in.
            return $client->send("Hello!", $channel)->then(null, function (\Exception $exception) {  // <-- First callback isn't
                                                                                // necessary, since send() doesn't resolve with a
                                                                                // return value and we don't need to do anything else afterwards.
                echo "Sending message failed!\n" . $exception . "\n";
            });
        }, function (\Exception $exception) {
            // Pass in a second callback to then() to catch exceptions.
            echo "Getting channel failed!\n" . $exception . "\n";
        });
    }
});

// Connect to the Slack server.
$client->connect()->then(function () {
    echo "Connected!\n";
});


// Run the event loop.
$loop->run();