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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.

Descripción

class DOMXPath {

mixed evaluate ( string expression [, DOMNode contextnode] )

}

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

Lista de parámetros

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.

Valores retornados

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

Ejemplos

Ejemplo 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";

?>

El resultado del ejemplo seria:

There are 2 english books

Ver también

DOMXPath->query()

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DOMXPath->__construct()SubirDOMXPath->query()



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