DOMXPath->evaluate()

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

Opis

class DOMXPath {

mixed evaluate ( string expression [, DOMNode contextnode] )

}

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

Parametry

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.

Zwracane wartości

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

Przykłady

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

Patrz także

DOMXPath->query()

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Generated: 2007-01-26 18:02:40