PHP: xpath_new_context

xpath_new_context

(PHP 4 >= 4.0.4, PECL)

xpath_new_context -- Creates new xpath context

Описание

XPathContext xpath_new_context ( domdocument dom_document )

xpath_new_context

webmaster at ebinformatique dot com
07-Feb-2006 10:32


Should that not be placed as:

DomDocument->xpath_new_context as it seems to be a method used from a DomDocument object.

augusto at omnitec dot it
22-Jun-2004 10:52


Split easily XPath result into associative array:



function xpath_parser($xml_file, $xpath_query) {



    $xml_file = realpath($xml_file);



    if (file_exists($xml_file)) {



        $doc = domxml_open_file($xml_file);



        $ctx = $doc->xpath_new_context();            



        if ($xpathObj = @$ctx->xpath_eval($xpath_query)) {



            $return = array();



            foreach($xpathObj->nodeset as $risultato) {



                $tagName = $risultato->tagname();

                $content = $risultato->get_content();



                if (array_key_exists($tagName, $return)) {



                    $return[$tagName][] = $content;



                }else {



                    if (count($doc->get_elements_by_tagname($tagName)) > 1) {



                        $return[$tagName] = array($content);



                    }else {



                        $return[$tagName] = $content;



                    }

                }

            }



        }else {  return("<b>Error :</b> Wrong XPath query");  }

    }else {  return("<b>Errore :</b> File not exist or wrong filepath!");  }



    return $return;

}



usage:



$xml_file = "./listaCD.xml";

$query = "/listacd/*";



echo "<pre>";

print_r(xpath_parser($xml_file, $query));

echo "</pre>";

27-May-2003 10:16


I found a nice function in XML_sql2xml. With it, you can get, easily,  the result of a xpath expression.



function getXpathValues(&$dom, $expr) {

    $xpth = $dom->xpath_new_context();

        $xnode = xpath_eval($xpth,$expr);

        if (isset ($xnode->nodeset[0])) {

            $firstnode = $xnode->nodeset[0];

            $children = $firstnode->children();

            $value = $children[0]->content;

        return $value;

    }

        else return Null;

}



Usage :



$dom = domxml_open_file('pear.rss');

echo $this->getXpathValues($dom, "//channel/title");