DOMXPath
PHP Manual

DOMXPath::evaluate

(PHP 5 >= 5.1.0)

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

Descrierea

mixed DOMXPath::evaluate ( string $expression [, DOMNode $contextnode ] )

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

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.

Valorile întoarse

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

Exemple

Example #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";

?>

Exemplul de mai sus va afișa:

There are 2 english books

Vedeți de asemenea


DOMXPath
PHP Manual