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DOMXPath->evaluate()

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

Descrizione

class DOMXPath {

mixed evaluate ( string expression [, DOMNode contextnode] )

}

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

Elenco dei parametri

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.

Valori restituiti

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

Esempi

Esempio 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";

?>

The above example will output:

There are 2 english books

Vedere anche:

DOMXPath->query

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DOMXPath->__construct()RisaliDOMXPath->query

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Generated: 2007-01-26 17:56:40