title: PHP in HTML(accessing $_POST data)
body: <p>kalkulaator.php</p>
  
  <pre><code>&lt;form method="post" action="arvutus.php"&gt;
      &lt;input type="text" name="value"&gt;
      &lt;input type="submit"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>arvutus.php</p>
  
  <pre><code>$value = $value-($value*0.04-($value*0.04-144)*0.21);
  echo "Result is " . $_POST["value"] . "";
  </code></pre>
  
  <p>How can I make these calculation with value ?</p>