(PHP Extension) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

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<?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();

$success = $xml->LoadXmlFile('qa_data/xml/fruit.xml');
if ($success != true) {
    print $xml->lastErrorText() . "\n";
    exit;
}

// Iterate over the direct children by using FirstChild / NextSibling
// child is a CkXml
$child = $xml->FirstChild();
$bContinue = $xml->get_LastMethodSuccess();
while (($bContinue == true)) {
    print $child->tag() . ' : ' . $child->content() . "\n";
    // nextSibling is a CkXml
    $nextSibling = $child->NextSibling();
    $bContinue = $child->get_LastMethodSuccess();

    // child is a CkXml
    $child = $nextSibling;
}

print '-----' . "\n";

// Do the same, but with FirstChild2 / NextSibling2 to avoid
// creating so many XML object instances:
$success = $xml->FirstChild2();
while ($success == true) {
    print $xml->tag() . ' : ' . $xml->content() . "\n";
    $success = $xml->NextSibling2();
}

// Revert back up to the parent:
$success = $xml->GetParent2();

print '-----' . "\n";

// Iterate in reverse order using LastChild / PreviousSibling
// child is a CkXml
$child = $xml->LastChild();
$bContinue = $xml->get_LastMethodSuccess();
while (($bContinue == true)) {
    print $child->tag() . ' : ' . $child->content() . "\n";
    // prevSibling is a CkXml
    $prevSibling = $child->PreviousSibling();
    $bContinue = $child->get_LastMethodSuccess();

    // child is a CkXml
    $child = $prevSibling;
}

print '-----' . "\n";

// Do the same, but with LastChild2 / PreviousSibling2 to avoid
// creating so many XML object instances:
$success = $xml->LastChild2();
while ($success == true) {
    print $xml->tag() . ' : ' . $xml->content() . "\n";
    $success = $xml->PreviousSibling2();
}

// Revert back up to the parent:
$success = $xml->GetParent2();

?>