PHP XML DOM: working with a subsection of an xml document
<quizzes>
  <quiz>
    <date>Yesterday</date>
    <question>This is the day's question</question
  </quiz>
  <quiz>
    <date>Today</date>
    <question>This is the day's question</question
  </quiz>
  <quiz>
    <date>Tomorrow</date>
    <question>This is the day's question</question
  </quiz>
</quizzes

$xmlDoc = new DOMDocument()
$xmlDoc->load($aboveXMLFile)

$subSection = $xmlDoc->getElementsByTagName("quiz")->item(0)
$dateofSubSection = $subSection->getElementsByTagName("date")->item(0)->nodeValue;
echo $dateofSubSection