slack_test.php

<?php

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/vendor/symfony/symfony/src/Symfony/Component/VarDumper/Resources/functions/dump.php';

$identity = new \DZunke\SlackBundle\Slack\Messaging\Identity();
$identity->setUsername('CoffeeBrewer');
$identity->setIconEmoji(':coffee:');

$connection = new \DZunke\SlackBundle\Slack\Client\Connection();
$connection->setEndpoint('https://slack.com/api');
$connection->setToken('MY_TOKEN');

$client = new \DZunke\SlackBundle\Slack\Client($connection);

$response = $client->send(
    \DZunke\SlackBundle\Slack\Client\Actions::ACTION_POST_MESSAGE,
    [
        'identity' => $identity,
        'channel' => '#slack-testing',
        'text'    => 'Good Morning, please make sure u got a coffee before working!'
    ]
);

dump($response);