2.27.1. Telegram bot

https://api.telegram.org/bottoken/setWebhook?url=https://domain.com/path/to/file.php

Substitute your values for the following parameters:

• token - specify the token received when creating the bot. Note, change before token word bot not necessary.
• domain.com - correctly specify the domain name that will work in the future. It is not recommended to specify an address with www or without www if a redirect to a return address is set.
• path/to/file.php - indicate correct URL-address of the file itself, which will process the bot's requests.

After opening such an address in the browser, a message should appear on the open page like “Webhook was set". If such a message appears, then the Webhook is installed correctly, otherwise, double-check the used URL-address and SSL certificate operation.

To install Webhook in the script, it is enough at its beginning, after declaring variables with the data of the token and the bot name, specify the following code:

if(!json_decode(file_get_contents("https://api.telegram.org/name:token/setWebhook?url=https://domain.com/path/to/file.php"))->ok){die('webhook is not set');}

<?php
define('token','XXXXXXXXXXXXXXXXXXXXXXXXX'); // вместо ''XXXXXXXXXXXXXXXXXXXXXXXXX'' specify your token
$result = json_decode(file_get_contents('php://input'), true); // передаём в переменную $result complete information about the user's message
if ($result['message']['text'] == '/start') {
    file_get_contents("https://api.telegram.org/bot" . token . "/sendMessage?chat_id=" . $result['message']['chat']['id'] . "&text=" . urlencode('Hi')); // отправляем ответ пользователю, используя его уникальный идентификатор $result['message']['chat']['id'] as recipient
}

<?php
include('vendor/autoload.php'); // подключаем библиотеку
use Telegram\Bot\Api; 
 
$telegram = new Api('XXXXXXXXXXXXXXXXXXXXXXXXX'); // вместо ''XXXXXXXXXXXXXXXXXXXXXXXXX'' specify your token
$result = $telegram -> getWebhookUpdates(); // передаём в переменную $result complete information about the user's message
 
$text = $result["message"]["text"]; // текст сообщения
$chat_id = $result["message"]["chat"]["id"]; // уникальный идентификатор пользователя
$name = $result["message"]["from"]["username"]; // имя пользователя
 
if ($text) {
    if ($text == "/start") {
        $reply = "Hi!";
        $telegram->sendMessage(['chat_id' => $chat_id, 'text' => $reply]);
    }
}