DOMXPath->query()
Evaluates the given XPath expression
&reftitle.description;
DOMXPath
DOMNodeListquery
stringexpression
DOMNodecontextnode
Executes the given XPath expression.
&reftitle.parameters;
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.
&reftitle.returnvalues;
Returns a DOMNodeList containing all nodes matching
the given XPath expression. Any expression which do
not return nodes will return an empty DOMNodeList.
&reftitle.examples;
Getting all the english books
preserveWhiteSpace = false;
$doc->Load('book.xml');
$xpath = new DOMXPath($doc);
// We starts from the root element
$query = '//book/chapter/para/informaltable/tgroup/tbody/row/entry[. = "en"]';
$entries = $xpath->query($query);
foreach ($entries as $entry) {
echo "Found {$entry->previousSibling->previousSibling->nodeValue}," .
" by {$entry->previousSibling->nodeValue}\n";
}
?>
]]>
&example.outputs;
We can also use the contextnode parameter to shorten
our expression:
preserveWhiteSpace = false;
$doc->load('book.xml');
$xpath = new DOMXPath($doc);
$tbody = $doc->getElementsByTagName('tbody')->item(0);
// our query is relative to the tbody node
$query = 'row/entry[. = "en"]';
$entries = $xpath->query($query, $tbody);
foreach ($entries as $entry) {
echo "Found {$entry->previousSibling->previousSibling->nodeValue}," .
" by {$entry->previousSibling->nodeValue}\n";
}
?>
]]>
&reftitle.seealso;