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DOMXPath->evaluate()

(no version information, might be only in CVS)

DOMXPath->evaluate() --  Evaluates the given XPath expression and returns a typed result if possible.

Beschreibung

class DOMXPath {

mixed 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";

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

There are 2 english books

Siehe auch

DOMXPath->query()

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DOMXPath->__construct()Nach obenDOMXPath->query()

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Generated: 2007-01-26 17:57:14