You can post message for Yammer.
composer require ssmr9dt/YammerMessage
Reference test/start.php
require __DIR__ . "/../vendor/autoload.php";
define("YAMMER_TOKEN", "#########");
$YammerMessage = new ssmr9dt\YammerMessage();
$YammerMessage->sendMessage("Hello, World.", 11111, ["cc" => ["ssmr9dt@gmail.com"]]);
This software is released under the MIT License, see LICENSE.