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PHP : Function Reference : DOM XML Functions : xpath_new_context

xpath_new_context

Creates new xpath context (PHP 4 >= 4.0.4)
XPathContext xpath_new_context ( domdocument dom_document )

See also xpath_eval().

Code Examples / Notes » xpath_new_context

david

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.


augusto

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>";


webmaster

Should that not be placed as:
DomDocument->xpath_new_context as it seems to be a method used from a DomDocument object.


27-may-2003 06:16

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");


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