如何将XML转换为PHP数组

$array = array();
foreach ($xml->children() as $element) {
  $name = $element->getName();
  $attributes = $element->attributes();
  if (!$attributes) {
    if (!isset($array[$name])) {
      $array[$name] = (string) $element;
    } else {
      if (!is_array($array[$name])) {
        $array[$name] = array($array[$name]);
      }
      $array[$name][] = (string) $element;
    }
  } else {
    $array[$name][] = array();
    foreach ($attributes as $attrName => $attrValue) {
      $array[$name][count($array[$name])-1]['_'.$attrName] = (string) $attrValue;
    }
     if ($element->children()) {
      $array[$name][count($array[$name])-1] = array_merge($array[$name][count($array[$name])-1],$this->xml2array($element));
    } else {
      $array[$name][count($array[$name])-1]['value'] = (string) $element;
    }
  }
}