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PHP Dokumentation: Domxpath evaluate

12. Januar 2010 von werner

DOMXPath::evaluate

(PHP 5 >= 5.1.0)

DOMXPath::evaluate — Evaluates the given XPath expression and returns a typed result if possible.

Beschreibung

mixed DOMXPath::evaluate ( string $expression [, DOMNode $contextnode ] )

Executes the given XPath expression and returns a typed result if possible.

Parameter-Liste

expression: The XPath expression to execute.
contextnode: The optional contextnode can be specified for doing relative XPath queries. By default, the queries are relative to the root element.

Rückgabewerte

Returns a typed result if possible or a DOMNodeList containing all nodes matching the given XPath expression.

Beispiele

Beispiel #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";