First Telegram bot

composer.json

{
    "require": {
        "telegram-bot/api": "^2.2"
    }
}

index.php

<?php
require_once 'vendor/autoload.php';

define('BOT_TOKEN', 'TOKEN');
define('BOT_USERNAME', 'BotName');

$timestampFilename = './last_timestamp';

$startMessage = 'С Днем Рождения, здоровяк! Пиши команду /get_task и получай задание';
$questMessage = 'Поковыряйся пальцем в носу, там ты найдешь записку';

$timestampFile = fopen($timestampFilename, 'r') or die('Unable to open file!');
$lastTimestamp = fread($timestampFile, filesize($timestampFilename));
fclose($timestampFile);

try {
	$bot = new \TelegramBot\Api\BotApi(BOT_TOKEN);
	$updates = $bot->getUpdates();
	$count = sizeof($updates);
	
	for($i = 0; $i < $count; $i++) {
		$message = $updates[$i]->getMessage();
		$chatId = $message->getChat()->getId();
		$text = $message->getText();
		$date = $message->getDate();
		
		if($lastTimestamp >= $date) continue;
		
		if($text == '/start') {
			
			$bot->sendMessage($chatId, $startMessage);
			
		} else if($text == '/get_task') {
			
			$bot->sendMessage($chatId, $questMessage);
			
		}
	}
	
	// PHP specific code, because $date variable is not nulled after cycle
	$timestampFile = fopen($timestampFilename, 'w');
	fwrite($timestampFile, $date);
	fclose($timestampFile);
	
	
} catch (\TelegramBot\Api\Exception $e) {
    echo $e->getMessage();
}

last_timestamp

1496185858