(PHP using ActiveX) 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>

Download Chilkat XML ActiveX

<?php

$xml = new COM("Chilkat.Xml");

//  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
$success = $xml->LoadXmlFile('fruit.xml');
if ($success != 1) {
    print $xml->lastErrorText() . "\n";
    exit;
}

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

    // child is a Chilkat.Xml
    $child = $nextSibling;
}

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

//  Do the same, but with FirstChild2 / NextSibling2 to avoid
//  creating so many XML object instances:
$success = $xml->FirstChild2();
while ($success == 1) {
    print $xml->tag() . ' : ' . $xml->content() . "\n";
    $success = $xml->NextSibling2();
}

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

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

//  Iterate in reverse order using LastChild / PreviousSibling
// child is a Chilkat.Xml
$child = $xml->LastChild();
while (!(is_null($child))) {
    print $child->tag() . ' : ' . $child->content() . "\n";
    // prevSibling is a Chilkat.Xml
    $prevSibling = $child->PreviousSibling();

    // child is a Chilkat.Xml
    $child = $prevSibling;
}

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

//  Do the same, but with LastChild2 / PreviousSibling2 to avoid
//  creating so many XML object instances:
$success = $xml->LastChild2();
while ($success == 1) {
    print $xml->tag() . ' : ' . $xml->content() . "\n";
    $success = $xml->PreviousSibling2();
}

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

?>