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(PHP Extension) XML Tree Traversal Order for Search* MethodsThe Chilkat XML API provides a number of Search* methods for locating XML nodes based on criteria. These methods traverse an XML document in a breadth-first order. (See Breadth-First Search). The XML document used in this example has the following tree structure:
The nodes are traversed in the order: A, B, C, D, E, F, G, H, I, J, K. The input XML, available at http://www.chilkatsoft.com/data/searchOrder.xml, is this: <a>crocodileA <b>crocodileB <d>crocodileD</d> <e>crocodileE <h>crocodileH</h> <i>crocodileI</i> </e> </b> <c>crocodileC <f>crocodileF</f> <g>crocodileG <j>crocodileJ</j> <k>crocodileK</k> </g> </c> </a>
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); $xml = new CkXml(); // The sample input XML is available at http://www.chilkatsoft.com/data/searchOrder.xml $success = $xml->LoadXmlFile('searchOrder.xml'); if ($success != true) { print $xml->lastErrorText() . "\n"; exit; } // IMPORTANT: The following loop for iterating over all // matching nodes performs reasonably well for small to // mid-size XML documents or sub-trees. Performance // can be poor when the sub-tree contains many thousands // of nodes (or more). // NOTE: The search is always rooted at the calling node. // In this example, it happens to also be the root node of the entire // XML document. Searches can be performed on sub-trees // within the document by calling the Search* method from // the root node of a sub-tree. // Demonstrate the breadth-first traversal: // xBeginAfter is a CkXml $xBeginAfter = $xml->GetSelf(); // xFound is a CkXml $xFound = $xml->SearchAllForContent($xBeginAfter,'*croc*'); while (($xml->get_LastMethodSuccess() == true)) { print $xFound->tag() . "\n"; // xBeginAfter is a CkXml $xBeginAfter = $xFound; // xFound is a CkXml $xFound = $xml->SearchAllForContent($xBeginAfter,'*croc*'); } ?> |
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