implementation

.gitignore

@@ -0,0 +1 @@
+config.ini

.idea/php.xml

@@ -10,6 +10,7 @@
     <option name="highlightLevel" value="WARNING" />
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpProjectSharedConfiguration" php_language_level="8.2" />
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>

config-example.ini

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+; Each bot is given a unique authentication token when it is created.
+; The token looks something like 123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11.
+; You can learn about obtaining tokens and generating new ones in the Telegram Bot API document.
+token =
+
+; The Telegram Bot API endpoint. Change this when you want to use your own Bot API server.
+endpoint = https://api.telegram.org/bot
+
+; The file that saves the last update id to tell Telegram that we already processed the updates.
+last_update_id_file = last-update-id.txt
+
+; Limits the number of updates to be retrieved. Values between 1-100 are accepted. Defaults to 100.
+limit = 100
+
+; Timeout in seconds for long polling.
+; Defaults to 0, i.e. usual short polling.
+; Should be positive, short polling should be used for testing purposes only.
+timeout = 60

last-update-id.txt

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+952645275

main.php

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+#!/usr/bin/env php
+<?php
+$configFilename = __DIR__ . '/config.ini';
+
+if (!file_exists($configFilename)) {
+  error_log('Failed to read config.ini file. You may copy from config-example.ini and edit it.');
+  exit(1);
+}
+
+$config = parse_ini_file($configFilename);
+
+// save and load last update id
+$getLastUpdateId = fn() => file_exists($config['last_update_id_file']) ? (int)file_get_contents($config['last_update_id_file']) : 0;
+$putLastUpdateId = fn($lastUpdateId) => file_put_contents($config['last_update_id_file'], "$lastUpdateId");
+
+// request Telegram Bot API
+$requestApi = fn(string $method, ?array $payload = null) => json_decode(file_get_contents(
+  "$config[endpoint]$config[token]/$method",
+  false,
+  stream_context_create(['http' => [
+    'method' => 'POST',
+    'header' => 'Content-Type: application/json',
+    'content' => json_encode($payload),
+  ]]),
+), true);
+
+// some method we are using
+$getMe = fn() => $requestApi('getMe');
+$getUpdates = fn(int $offset = 0) => $requestApi('getUpdates', [
+  'offset' => $offset,
+  'limit' => (int)$config['limit'],
+  'timeout' => (int)$config['timeout'],
+]);
+$sendMessage = fn($params) => $requestApi('sendMessage', $params);
+
+$response = $getMe();
+if (!$response['ok']) {
+  error_log('Failed to start the bot.');
+  error_log("Error message: $response[description]");
+  error_log("Error code: $response[error_code]");
+  exit(1);
+}
+
+$me = $response['result'];
+error_log('Login as: ' . json_encode($me, JSON_UNESCAPED_UNICODE));
+error_log('Start receiving updates…');
+while (($response = $getUpdates($getLastUpdateId() + 1))['ok']) {
+  $updates = $response['result'];
+  $lastUpdateId = null;
+  foreach ($updates as $update) {
+    $lastUpdateId = $update['update_id'];
+
+    error_log('Got an update: ' . json_encode($update, JSON_UNESCAPED_UNICODE));
+    if (isset($update['message'])) {
+      $sendMessage([
+        'chat_id' => $update['message']['chat']['id'],
+        'text' => '喵',
+        'reply_to_message_id' => $update['message']['message_id'],
+      ]);
+    }
+
+    $putLastUpdateId($lastUpdateId);
+  }
+}
+
+if (!$response['ok']) {
+  error_log('Failed to get updates.');
+  error_log("Error message: $response[description]");
+  error_log("Error code: $response[error_code]");
+  exit(1);
+}