Yukarıda örnek verilmiş zaten hocam sen direk kod bloğunu istiyorsun

/*

<?php
$xml = "<?xml version='1.0'?><document><urunid>11</urunid><urunadi>Can</urunadi><urunmarka>Canan</urunmarka></document>";
$xml = simplexml_load_string($xml);

?>

<select>
<option value="<?php echo $xml->urunid; ?>"><?php echo $xml->urunid; ?></option>
<option value="<?php echo $xml->urunadi; ?>"><?php echo $xml->urunadi; ?></option>
<option value="<?php echo $xml->urunmarka; ?>"><?php echo $xml->urunmarka; ?></option>
</select>

*/