DOMXPath::evaluate

(PHP 5 >= 5.1.0)

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

Описание

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

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

Список параметров

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.

Возвращаемые значения

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

Примеры

Пример #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";

?>

Результат выполнения данного примера:

There are 2 english books

Смотрите также

DOMXPath::query