title: Telegram Bot - Cannot remove custom keyboard using PHP
body: <p>please help me. I added a custom keyboard via reply_markup like this:</p>
  
  <pre><code>        $reply_markup = array(
              'keyboard' =&gt; array(
                  array(
                      array( 
                          'text' =&gt; 'Click here to upload contact &amp; validate it',
                          'request_contact' =&gt; true
                      )
                  )
              ),
              'one_time_keyboard' =&gt; true,
              'resize_keyboard' =&gt; true
          );
  
          $reply_markup = json_encode($reply_markup);
  
          API_URL."sendmessage?chat_id=".$chatID."&amp;text=".urlencode($reply)."&amp;reply_markup=".urlencode($reply_markup);
  </code></pre>
  
  <p>it is working fine. but now I need to remove the custom keyboard. I tried like this:</p>
  
  <pre><code>        $reply_markup = array(
              'remove_keyboard' =&gt; true
          );
  
          API_URL."sendmessage?chat_id=".$chatID."&amp;text=".urlencode($reply)."&amp;reply_markup=".urlencode($reply_markup);
  </code></pre>
  
  <p>it is not working. the custom keyboard only hidden, not removed. By the way, I am using PHP 7.</p>
  
  <p>Please help. Thank you in advance</p>