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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.

说明

class DOMXPath {

mixed evaluate ( string expression [, DOMNode contextnode] )

}

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

参数

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.

返回值

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

范例

例子 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";

?>

上例将输出：

There are 2 english books

参见

DOMXPath->query()



后退起点前进
DOMXPath->__construct()上一级DOMXPath->query()