broadcast.php

<?php
/**
 * Usage on CLI: $ php broadcast.php [telegram-chat-id] [message]
 */

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

use Longman\TelegramBot\Request;
use Longman\TelegramBot\Telegram;

$API_KEY  = '--botfather-api-key--';
$BOT_NAME = '--botfather-bot-name--';

$telegram = new Telegram($API_KEY, $BOT_NAME);

// Get the chat id and message text from the CLI parameters.
$chat_id = isset($argv[1]) ? $argv[1] : '';
$message = isset($argv[2]) ? $argv[2] : '';

if ($chat_id !== '' && $message !== '') {
    $data = [
        'chat_id' => $chat_id,
        'text'    => $message,
    ];

    $result = Request::sendMessage($data);

    if ($result->isOk()) {
        echo 'Message sent succesfully to: ' . $chat_id . "\n";
    } else {
        echo 'Sorry message not sent to: ' . $chat_id . "\n";
    }
}

Outgoing messages aren't saved to the database, you will have to do that yourself. You can create your own table in the database and fill it with the message content.

Hope that helps