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";
    }
}

I understand that the messages that people enter in the chat goes to the mysql database, yes, i got them and i use them. Is there any way i can add something to this broadcast.php code so the messages from the bot get saved in the mysql database too? Thanks a lot.

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