​x
 
<!DOCTYPE html>
<html>
<body>
​
<?php
$xml=<<<XML
<cars>
  <car name="Volvo">
    <child/>
    <child/>
    <child/>
    <child/>
  </car>
  <car name="BMW">
    <child/>
    <child/>
  </car>
</cars>
XML;
​
$elem = new SimpleXMLElement($xml);
foreach ($elem as $car)
  {
  printf("%s 有 %d 个子元素。<br>", $car['name'], $car->count());
 }
?>
​
</body>
</html>