XML teglarining defisli nomlari PHPda

Teg nomida defis bo'lsin:

test.xml<root>
  <tag>
    <elem-child>text</elem-child>
  </tag>
</root>

Bunday holatda, shu teg bilan ishlash uchun quyidagi usuldan foydalanishimiz kerak bo'ladi:

php<?php
  echo $xml->tag->{'elem-child'}; // 'text'
?>

html<root>
  <user-name>john</user-name>
  <user-surn>smit</user-surn>
</root>