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DOMXPath::evaluate


(PHP 5 >= 5.1.0)

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

Beschreibung

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

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

Parameter-Liste

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.

Rückgabewerte

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

Beispiele

PHP Code
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$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";

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

There are 2 english books

Siehe auch