$xml = "<?xml version='1.0'?><document><urunid>17</urunid><urunadi>Tv</urunadi><urunmarka>Samsung</urunmarka></document>";
$xml = simplexml_load_string($xml);

echo '<select name="xml">';
foreach($xml as $key => $val) echo '<option name="'.$key.'">'.$key.'</option>';
echo '</select>';