title: How to get user input in Twillio on the same file
body: <p>i want to get user input in the same file and use for some manipulation.</p>
  
  <pre><code>    echo '&lt;Say&gt;Please enter the number followed by hash key..&lt;/Say&gt;';
  
      echo '&lt; Gather  '.$number1    = (int) $_REQUEST['Digits'].'&gt; &lt;/Gather&gt;' ;
  
      echo '&lt;Say&gt;Enter the secod number followed by the hash key...&lt;/Say&gt;';
      echo '&lt; Gather  '.      $number2 = (int) $_REQUEST['Digits'].'&gt; &lt;/Gather&gt;' ;
      $sum = $number1 + number2
      echo ' $sum'; 
  </code></pre>
  
  <p>is this a proper way to use the Gather ?</p>