Generate a single XML element (for example for an RSS feed). Much better than doing it by hand as it ensures the text content is valid / escaped.

xml_generate_tag.php

<?php
$doc = new DOMDocument();
$node = $doc->createElement("itunes:summary");

// either one is fine, both generate valid XML
// $text = $doc->createTextNode('I am <foo> example & so');
$text = $doc->createCDATASection('I am <foo> example & so');
   
$node->appendChild($text);
$doc->saveXML($node);
// => "<itunes:summary><![CDATA[I am <foo> example & so]]></itunes:summary>"