DOMXPath->query()

Description

Executes the given XPath expression.

Parameters

Return Values

Returns a DOMNodeList containing all nodes matching the given XPath expression. Any expression which do not return nodes will return an empty DOMNodeList.

Examples

Example 1. Getting all the english books <?php $doc = new DOMDocument; // We don't want to bother with white spaces $doc->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"; } ?> The above example will output: Found The Grapes of Wrath, by John Steinbeck Found The Pearl, by John Steinbeck We can also use the contextnode parameter to shorten our expression: <?php $doc = new DOMDocument; $doc->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"; } ?>

See Also