How to handle telegram button click?

Question

PHP

define('TOKEN','...');
$data=file_get_contents('php://input');
$data=json_decode($data,true);
if(!empty($data['message']['text'])){
  $text=$data['message']['text'];
  $keyboard_step_1=array(
    array(
      array(
        'text'=>'next',
        'callback_data'=>'{"action":"go_step_2","count":0,"text":"next"}'
      ),
      array(
        'text'=>'link',
        'url'=>'https://google.com'
      )
    )
  );
  $response=array(
    'chat_id'=>$data['message']['chat']['id'],
    'text'=>$text,
    'reply_markup'=>json_encode(
      array(
        'inline_keyboard'=>$keyboard_step_1
      )
    )
  );
  $ch = curl_init('https://api.telegram.org/bot'.TOKEN.'/sendMessage');  
  curl_setopt($ch, CURLOPT_POST, 1);  
  curl_setopt($ch, CURLOPT_POSTFIELDS, $response);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_HEADER, false);
  curl_exec($ch);
  curl_close($ch);
}

Made a simple echo bot, trying to add buttons.
How to handle next button click?
What happens when you click on the next button?

Answer 1

The answers to your questions are in the documentation. I recommend it for thoughtful reading.
https://core.telegram.org/bots/api#getting-updates
https://core.telegram.org/bots/api#callbackquery
When you click on the button, the view object CallbackQuerywill appear in the list that returns the method /getUpdates
If a webhook was configured, then a POST request containing object data CallbackQueryin JSON format will be sent to the url specified in the webhook .
Handle the button click based on your preferences and the required logic. In the simplest case - they saw the necessary event - they reacted (sent a message).
PHP code examples - https://core.telegram.org/bots/samples#php