How to use php sessions in xslt?

How do I use php sessions in XSLT for example for making a shopping cart for a webshop?

A user can browse the site and click "Add to cart" on several items. Each item should then be stored in a session variable. The user can at all time view the items selected by clicking "View cart".

From stackoverflow

• If you're using XSLT from within PHP, you can pass parameters to it by XSLTProcessor::setParameter(). You'll have to declare that parameter in XSL with

  <xsl:param name="«param name»"/>
  

  For example...

  PHP:

  // $xsl, $xml -- DOMDocument objects
  $proc = new XSLTProcessor;
  $proc->importStyleSheet($xsl);
  $proc->setParameter(''/*default namespace*/, 'test_param', $aValue);
  $proc->setParameter('', 'session_name', session_name());
  $proc->setParameter('', 'session_id', session_id());
  echo $proc->transformToXML($xml);
  

  XSL:

  <?xml version="1.0"?>
  <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
      <xsl:param name="test_param"/>
      <xsl:param name="session_name"/>
      <xsl:param name="session_id"/>
      <xsl:template match="/">
          <p>Your test parameter is: <xsl:value-of select="$test_param"/></p>
          <p>Your session name is: <xsl:value-of select="$session_name"/></p>
          <p>Your session ID is: <xsl:value-of select="$session_id"/></p>
          <p>
           <a>
            <xsl:attribute name="href">
              <xsl:value-of select="concat('http://example.com/index.php?',$session_name,'=',$session_id)"/>
            </xsl:attribute>
            Link with session
          </a>
         </p> 
      </xsl:template>
  </xsl:stylesheet>
  

  jorgen : I will try this! Thank you!

• you're probably calling the xslt processor on some XML, why don't you just add the session data to that xml ?