$xh = xslt_create();
    $arguments = array('/_xml' => $xml, '/_xsl' => $xsl);
   
    $params = array(
        //~ 'param1' => "hello world",
      );
   
    $result = xslt_process($xh, 'arg:/_xml', 'arg:/_xsl', NULL, $arguments,$params);
   
    xslt_free($xh);