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# DOMXPath->evaluate()

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

## Descrição

class DOMXPath {
mixed evaluate ( string expression [, DOMNode contextnode] )
}

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

## Lista de 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.

## Valores Retornados

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

## 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->query()

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DOMXPath->__construct() | Acima | DOMXPath->query()