I've compiled and installed php 5.1.6 on linux. Whereas i was getting "undefined function" whenever i would use evaluate(). Now i get it to run but the count() XPATH function does not work properly. I simply don't get anything back.
DOMXPath->evaluate()
(no version information, might be only in CVS)
DOMXPath->evaluate() -- Evaluates the given XPath expression and returns a typed result if possible.说明
class DOMXPath {mixed evaluate ( string expression [, DOMNode contextnode] )
}
Executes the given XPath expression and returns a typed result if possible.
参数
- 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.
返回值
Returns a typed result if possible or a DOMNodeList containing all nodes matching the given XPath expression.
范例
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User Contributed Notes
marwan dot zeineddine at gmail dot com
30-Oct-2006 11:50
30-Oct-2006 11:50
yuriucsal at NOSPAM dot yahoo dot com dot br
07-Mar-2005 04:55
07-Mar-2005 04:55
this class can substitute the method evaluate while it is not validated. Made for Yuri Bastos and Joo Gilberto Magalhes.
<?php
class XPtahQuery
{
// function returns a DOMNodeList from a relative xPath
public static function selectNodes($pNode, $xPath)
{
$pos = strpos(self::getFullXpath($pNode),"/",1);
$xPathQuery = substr(self::getFullXpath($pNode),$pos);//to paste /#document[1]/
$xPathQueryFull = $xPathQuery. $xPath;
$domXPath = new DOMXPath($pNode->ownerDocument);
$rNodeList = $domXPath->query($xPathQueryFull);
return $rNodeList;
}
// function returns a DOMNode from a xPath from other DOMNode
public static function selectSingleNode($pNode, $xPath)
{
$pos = strpos(self::getFullXpath($pNode),"/",1);
$xPathQuery = substr(self::getFullXpath($pNode),$pos);//to paste /#document[1]/
$xPathQueryFull = $xPathQuery. $xPath;
$domXPath = new DOMXPath($pNode->ownerDocument);
$rNode = $domXPath->query($xPathQueryFull)->item(0);
return $rNode;
}
//utilitaries functions off selectSingleNode
private function getNodePos($pNode, $nodeName)
{
if($pNode == null)
{
return 0;
}
else
{
$var = 0;
if ($pNode->previousSibling != null)
{
if ($pNode->previousSibling->nodeName == $nodeName)
{
$var = 1;
}
}
return self::getNodePos($pNode->previousSibling, $nodeName) + $var;
}
}
//utilitaries functions off selectSingleNode
private function getFullXpath($pNode)
{
if($pNode == null)
{
return "";
}
else
{
return self::getFullXpath($pNode->parentNode) . "/" . $pNode->nodeName . "[" .strval(self::getNodePos($pNode, $pNode->nodeName)+1) . "]";//+1 to get the real xPath index
}
}
}
?>
ernest at vogelsinger dot at
24-Jan-2005 02:54
24-Jan-2005 02:54
The DOMXPath::evaluate() method will not be available before v.5.1 (see bug database #31593). Only query() is available, which cannot evaluate all XPath expressions,such as count() or not().