XPath: how to iterate all text nodes? - php

Question

Please tell me how to iterate through all text nodes inside a paragraph? After all, they can be 2-3 level.
For example, take the following paragraph:
<p>Lorem <i>ipsum dolor</i> sit <span>amet, <b><i>consectetur</i> adipisicing</b> elit</span>. Odit, sunt?</p>
In which you want to process all text nodes and return them to their places.
$content = '<p>Lorem <i>ipsum dolor</i> sit <span>amet, <b><i>consectetur</i> adipisicing</b> elit</span>. Odit, sunt?</p>';
$html = new DOMDocument();
$html->loadHTML($content);
$xpath = new DOMXpath($html);
$elements = $xpath->query('//descendant-or-self::p//node()');
// My processor (not working...)
foreach ($elements as $element) {
// Processed, only text nodes (not working...)
if ( $element->nodeType == 3 ) {
function() {
return $element->nodeValue = '<span style="background-color: yellow;">' . $element->nodeValue . '</span>';
}
}
// return to the place
echo $element->C14N();
}
You need to get such result:
<p>
<span style="background-color: yellow;">Lorem </span>
<i>
<span style="background-color: yellow;">ipsum dolor</span>
</i>
<span style="background-color: yellow;">sit </span>
<span>
<span style="background-color: yellow;">amet, </span>
<b><i>
<span style="background-color: yellow;">consectetur</span>
</i>
<span style="background-color: yellow;">adipisicing</span>
</b>
<span style="background-color: yellow;">elit</span>
</span>
<span style="background-color: yellow;">. Odit, sunt?</span>
</p>

Answer 1

This will wrap all the text nodes into span elements:
$content = '<p>Lorem <i>ipsum dolor</i> sit <span>amet, <b><i>consectetur</i> adipisicing</b> elit</span>. Odit, sunt?</p>';
$html = new DOMDocument();
$html->loadHTML($content);
$xpath = new DOMXpath($html);
$elements = $xpath->query('//descendant-or-self::p//text()');
/* #var DomNode $element*/
foreach ($elements as $element) {
$span = $html->createElement("span", $element->nodeValue);
$span->setAttribute("style", "background-color: yellow;");
$element->parentNode->replaceChild($span, $element);
}
echo $html->saveHTML();