PHP Australia Conference 2015

xpath_new_context

(PHP 4)

xpath_new_context ساخت زمینه xpath

Description

XPathContext xpath_new_context ( domdocument $dom_document )

ساخت زمینه xpath.

See Also

  • xpath_eval() - ارزیابی محل مسیر XPath در رشته داده شده

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User Contributed Notes 4 notes

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David
8 years ago
WARNING FOR PHP5 USERS! (if you are having xpath problems)

There seem to be several versions of the DOM library/extension arround, it would appear that the one in this page is for PHP4 only, while this is the one in PHP5:

http://us2.php.net/manual/en/ref.dom.php

See the DOMXPath class for xpath functions.
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webmaster at ebinformatique dot com
8 years ago
Should that not be placed as:
DomDocument->xpath_new_context as it seems to be a method used from a DomDocument object.
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augusto at omnitec dot it
10 years ago
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>";
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Anonymous
11 years ago
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");
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