(PHP 5 >= 5.1.0)
DOMXPath::evaluate — Evaluates the given XPath expression and returns a typed result if possible.
Executes the given XPath expression and returns a typed result if possible.
The XPath expression to execute.
The optional contextnode can be specified for doing relative XPath queries. By default, the queries are relative to the root element.
Returns a typed result if possible or a DOMNodeList containing all nodes matching the given XPath expression.
Przykład #1 Getting the count of all the english books
<?php
$doc = new DOMDocument;
$doc->load('book.xml');
$xpath = new DOMXPath($doc);
$tbody = $doc->getElementsByTagName('tbody')->item(0);
// our query is relative to the tbody node
$query = 'count(row/entry[. = "en"])';
$entries = $xpath->evaluate($query, $tbody);
echo "There are $entries english books\n";
?>
Powyższy przykład wyświetli:
There are 2 english books