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Simple PHP Telegram Bot
<?php
define('BOT_TOKEN', '12345678:replace-me-with-real-token');
define('API_URL', 'https://api.telegram.org/bot'.BOT_TOKEN.'/');
function apiRequestWebhook($method, $parameters) {
if (!is_string($method)) {
error_log("Method name must be a string\n");
return false;
}
if (!$parameters) {
$parameters = array();
} else if (!is_array($parameters)) {
error_log("Parameters must be an array\n");
return false;
}
$parameters["method"] = $method;
header("Content-Type: application/json");
echo json_encode($parameters);
return true;
}
function exec_curl_request($handle) {
$response = curl_exec($handle);
if ($response === false) {
$errno = curl_errno($handle);
$error = curl_error($handle);
error_log("Curl returned error $errno: $error\n");
curl_close($handle);
return false;
}
$http_code = intval(curl_getinfo($handle, CURLINFO_HTTP_CODE));
curl_close($handle);
if ($http_code >= 500) {
// do not wat to DDOS server if something goes wrong
sleep(10);
return false;
} else if ($http_code != 200) {
$response = json_decode($response, true);
error_log("Request has failed with error {$response['error_code']}: {$response['description']}\n");
if ($http_code == 401) {
throw new Exception('Invalid access token provided');
}
return false;
} else {
$response = json_decode($response, true);
if (isset($response['description'])) {
error_log("Request was successfull: {$response['description']}\n");
}
$response = $response['result'];
}
return $response;
}
function apiRequest($method, $parameters) {
if (!is_string($method)) {
error_log("Method name must be a string\n");
return false;
}
if (!$parameters) {
$parameters = array();
} else if (!is_array($parameters)) {
error_log("Parameters must be an array\n");
return false;
}
foreach ($parameters as $key => &$val) {
// encoding to JSON array parameters, for example reply_markup
if (!is_numeric($val) && !is_string($val)) {
$val = json_encode($val);
}
}
$url = API_URL.$method.'?'.http_build_query($parameters);
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($handle, CURLOPT_TIMEOUT, 60);
return exec_curl_request($handle);
}
function apiRequestJson($method, $parameters) {
if (!is_string($method)) {
error_log("Method name must be a string\n");
return false;
}
if (!$parameters) {
$parameters = array();
} else if (!is_array($parameters)) {
error_log("Parameters must be an array\n");
return false;
}
$parameters["method"] = $method;
$handle = curl_init(API_URL);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($handle, CURLOPT_TIMEOUT, 60);
curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($parameters));
curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
return exec_curl_request($handle);
}
function processMessage($message) {
// process incoming message
$message_id = $message['message_id'];
$chat_id = $message['chat']['id'];
if (isset($message['text'])) {
// incoming text message
$text = $message['text'];
if (strpos($text, "/start") === 0) {
apiRequestJson("sendMessage", array('chat_id' => $chat_id, "text" => 'Hello', 'reply_markup' => array(
'keyboard' => array(array('Hello', 'Hi')),
'one_time_keyboard' => true,
'resize_keyboard' => true)));
} else if ($text === "Hello" || $text === "Hi") {
apiRequest("sendMessage", array('chat_id' => $chat_id, "text" => 'Nice to meet you'));
} else if (strpos($text, "/stop") === 0) {
// stop now
} else {
apiRequestWebhook("sendMessage", array('chat_id' => $chat_id, "reply_to_message_id" => $message_id, "text" => 'Cool'));
}
} else {
apiRequest("sendMessage", array('chat_id' => $chat_id, "text" => 'I understand only text messages'));
}
}
define('WEBHOOK_URL', 'https://my-site.example.com/secret-path-for-webhooks/');
if (php_sapi_name() == 'cli') {
// if run from console, set or delete webhook
apiRequest('setWebhook', array('url' => isset($argv[1]) && $argv[1] == 'delete' ? '' : WEBHOOK_URL));
exit;
}
$content = file_get_contents("php://input");
$update = json_decode($content, true);
if (!$update) {
// receive wrong update, must not happen
exit;
}
if (isset($update["message"])) {
processMessage($update["message"]);
}
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