Odczyt pogody z xml

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <prognoza>
    <id>Egipt</id>
      <temp>
        <w>  7.0</w>
        <w>  8.0</w>
      < w>  9.0</>
    </temp>
  </prognoza>
</root>

$root = simplexml_load_file('test.xml');
$wt = $root->prognoza->temp->w;
print_r($wt); echo '<br>';

foreach($wt as $w){
    echo 'temp:' .$w. '<br/>';
}

Wynik:
SimpleXMLElement Object ( [0] => 7.0 )
temp: 7.0
temp: 8.0
temp: 9.0