Telekhram bot

bot.php

<?php
	$token = '';
	$last_offset_filename = 'last_offset.txt';
	$last_offset = file_exists($last_offset_filename) ? file_get_contents($last_offset_filename) : '0';

	$ch = curl_init();
	curl_setopt_array($ch, [
	  CURLOPT_SSL_VERIFYPEER => 0,
	  CURLOPT_SSL_VERIFYHOST => 0,
	  CURLOPT_HEADER => 0,
	  CURLOPT_RETURNTRANSFER => 1,
	  ]);

	function getUpdates() {
	  global $token, $ch, $last_offset;
	  curl_setopt($ch, CURLOPT_URL, "https://api.telegram.org/bot$token/getUpdates?timeout=15&offset=$last_offset&allowed_updates[]=message");
	  return json_decode(curl_exec($ch), true);
	}

	function sendMessage($chat_id, $text, $parse_mode = null) {
	  global $token, $ch;
	  $query = ['chat_id' => $chat_id, 'text' => $text];
	  if ($parse_mode) {
	    $query['parse_mode'] = $parse_mode;
	  }
	  curl_setopt($ch, CURLOPT_URL, "https://api.telegram.org/bot$token/sendMessage?" . http_build_query($query));
	  curl_exec($ch);
	}

	while (true) {
	  $updates = getUpdates();
	  foreach ($updates['result'] as $update) {
	    $msg = $update['message'];
	    $text = $msg['text'];
	    $chat_id = $msg['chat']['id'];
	    if ($text === 'hi') {
	      sendMessage($chat_id, '<i>Hello!!!</i>', 'HTML');
	    }elseif ($text === '#quote') {
	    	sendMessage($chat_id, '<i>Control is an illusion...', 'HTML');
	    }elseif ($text === '#season_3.0' || $text === '#season_3' || $text === '#season3') {
	    	sendMessage($chat_id, '<p>Recording had been started in February 2017, and the 3rd season will release in October 2017</p>', 'HTML');
	    } 

	    else {
	      sendMessage($chat_id, '<pre>Unknown command</pre>', 'HTML');
	    }
	  }
	  if (isset($updates['result']) && sizeof($updates['result']) > 0) {
	    $last_offset = $updates['result'][sizeof($updates['result']) - 1]['update_id'] + 1;
	    file_put_contents($last_offset_filename, $last_offset);
	  }
	  sleep(1);
	}