title: IS UNDEFINED INDEX error is only limited to xampp
body: <p>The following code give undefined index in XAMPP but not on other APACHE Server is this error only limited to xampp </p>
  
  <pre><code>&lt;?php
      if($_POST['names']!=""&amp;&amp;$_POST['n']!="")
      {
      print_r($_POST);
      }
  ?&gt;
  
  &lt;form action="undefiend_error.php" method="post" &gt;
  &lt;input type="text" name="names" value=""&gt;
  &lt;input type="text" name="n" value=""&gt;
  &lt;input type="hidden" name="nd" value=""&gt;
  &lt;input type="submit" value="submit" &gt;
  &lt;/form&gt;
  </code></pre>