如何遍历从xml加载到php中的数组

$xml = simplexml_load_file('data.xml');

<root>
  <item>
    <name>Apple</name>
    <price>1.99</price>
  </item>
  <item>
    <name>Orange</name>
    <price>0.99</price>
  </item>
</root>

foreach ($xml->item as $item) {
  echo "Name: " . $item->name . "<br>";
  echo "Price: " . $item->price . "<br><br>";
}

Name: Apple
Price: 1.99

Name: Orange
Price: 0.99

<root>
  <item>
    <name>Apple</name>
    <price>1.99</price>
    <details>
      <color>Red</color>
      <weight>100g</weight>
    </details>
  </item>
  <item>
    <name>Orange</name>
    <price>0.99</price>
    <details>
      <color>Orange</color>
      <weight>150g</weight>
    </details>
  </item>
</root>

function traverseXML($xml) {
  foreach ($xml->children() as $child) {
    if ($child->count() > 0) {
      traverseXML($child);
    } else {
      echo $child->getName() . ": " . $child . "<br>";
    }
  }
}

traverseXML($xml);

name: Apple
price: 1.99
color: Red
weight: 100g
name: Orange
price: 0.99
color: Orange
weight: 150g