Atribúty skupiny XML tagov v PHP

Nech máme teraz niekoľko tagov s atribútmi:

test.xml<root>
  <tag attr="val1">text1</tag>
  <tag attr="val2">text2</tag>
  <tag attr="val3">text3</tag>
</root>

Získajme texty týchto tagov:

index.php<?php
  foreach ($xml->tag as $tag) {
    echo $tag; // 'text1', 'text2', 'text3'
  }
?>

A teraz - hodnoty atribútov:

index.php<?php
  foreach ($xml->tag as $tag) {
    echo $tag['attr']; // 'val1', 'val2', 'val3'
  }
?>

html<root>
  <product cost="100" amount="3">
    prod1
  </product>
  <product cost="200" amount="4">
    prod2
  </product>
  <product cost="300" amount="5">
    prod3
  </product>
</root>