Script for pulling telegram bot updates and forwarding to your webhook.

tg-forwarder.php

#!/usr/bin/env php
<?php

class Forwarder
{
    private $offset = 0;
    private $limit = 100;
    private $timeout = 120;
    private $botToken;
    private $webHook;

    public function __construct($botToken, $webHook)
    {
        $this->botToken = $botToken;
        $this->webHook = $webHook;
    }

    public function process()
    {
        $payload = json_encode([
            'offset' => $this->offset,
            'limit' => $this->limit,
            'timeout' => $this->timeout,
        ]);

        $getUpdatesUrl = sprintf('https://api.telegram.org/bot%s/getUpdates', $this->botToken);

        list($response) = $this->request($getUpdatesUrl, $payload);

        $updates = json_decode($response, true);

        foreach ($updates['result'] as $update) {
            echo 'Forwarding update: '.json_encode($update, JSON_PRETTY_PRINT |  JSON_UNESCAPED_UNICODE).PHP_EOL;

            list($webhookResponse, $code) = $this->request($this->webHook, json_encode($update));

            echo sprintf('Webhook responded: [%d] %s', $code, $webhookResponse).PHP_EOL;

            $this->offset = $update['update_id'] + 1;
        }
    }

    private function request($url, $payload)
    {
        $curl = curl_init();

        curl_setopt_array($curl, [
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => '',
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => $this->timeout,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => 'POST',
            CURLOPT_POSTFIELDS => $payload,
            CURLOPT_HTTPHEADER => [
                'Content-Type: application/json',
                'Content-Length: '.strlen($payload),
            ],
        ]);

        $response = curl_exec($curl);
        $code = curl_getinfo($curl, CURLINFO_RESPONSE_CODE);
        $err = curl_error($curl);

        if ($err) {
            error_log($err);
        }

        curl_close($curl);

        return [$response, $code];
    }
}

function main($argc, $argv)
{
    if (!isset($argv[1])) {
        error_log('You must specify telegram bot token and webhook url');
        exit(1);
    }

    if (!isset($argv[2])) {
        error_log('You must specify webhook url');
        exit(1);
    }

    $botToken = $argv[1];
    $webHook = $argv[2];

    $forwarder = new Forwarder($botToken, $webHook);

    while (true) {
        $forwarder->process();
    }
}

main($argc, $argv);