DOMXPath::__construct
It seems this method is only included from PHP 5.1.
DOMXPath::evaluate
(PHP 5 >= 5.1.0)
DOMXPath::evaluate — Évalue une expression XPath donnée et retourne un résultat écrit si possible
Description
Exécute l'expression XPath expression et retourne un résultat écrit si possible.
Liste de paramètres
- expression
-
L'expression XPath à exécuter.
- contextnode
-
Le paramètre optionnel contextnode peut être spécifié pour effectuer des requêtes XPath relatives. Par défaut, les requêtes sont relatives à l'élément root.
Valeurs de retour
Retourne un résultat écrit si possible ou un DOMNodeList contenant tous les noeuds correspondant à 'expression XPath expression .
Exemples
Exemple #1 Récupération du nombre total de livres anglais
<?php
$doc = new DOMDocument;
$doc->load('book.xml');
$xpath = new DOMXPath($doc);
$tbody = $doc->getElementsByTagName('tbody')->item(0);
// notre requête est relative au noeud tbody
$query = 'count(row/entry[. = "en"])';
$entries = $xpath->evaluate($query, $tbody);
echo "Il y a $entries livres anglais\n";
?>
L'exemple ci-dessus va afficher :
Il y a 2 livres anglais
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User Contributed NotesDOMXPath::evaluate
yuriucsal at NOSPAM dot yahoo dot com dot br
06-Mar-2005 08:55
06-Mar-2005 08:55
this class can substitute the method evaluate while it is not validated. Made for Yuri Bastos and Jo�o Gilberto Magalh�es.
<?php
class XPtahQuery
{
// function returns a DOMNodeList from a relative xPath
public static function selectNodes($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
}
}
}
?>