DOMXPath
PHP Manual

DOMXPath::evaluate

(PHP 5 >= 5.1.0)

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

Descrição

mixed DOMXPath::evaluate ( string $expression [, DOMNode $contextnode [, boolean $registerNodeNS = true ]] )

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

Parâmetros

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.

registerNodeNS

The optional registerNodeNS can be specified to disable automatic registration of the context node.

Valor Retornado

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

Histórico

Versão Descrição
5.3.3 The registerNodeNS parameter was added.

Exemplos

Exemplo #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";

?>

O exemplo acima irá imprimir:

There are 2 english books

Veja Também


DOMXPath
PHP Manual