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DOMXPath->evaluate()

Evaluates the given XPath expression and returns a typed result if possible. ()

DOMXPath {
  mixed evaluate(string expression,
                 DOMNode contextnode);

}

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

Parameters

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.

Return Values

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

Examples

Example 544. 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";

?>

The above example will output:

There are 2 english books