Reading XML file with PHP, XML file is not organized

Hi all I have an XML file like this:

<?xml version="1.0"?>
<catalog>
   <car>
      <title>This is car</title>
      <price>44.95</price>
      <model>2018</model>
      <description>An in-depth look at creating applications with XML.</description>
   </car>

   <bike>
      <title>this is bike</title>
      <price>33.58</price>
      <description>Just the dummy description</description>
   </bike>
   <wheels>
      <title>this is wheel</title>
      <price>33.58</price>
      <description>Just the dummy description</description>
   </wheels>

   <bike>
      <title>this is bike</title>
      <price>33.58</price>
      <description>Just the dummy description</description>
   </bike>


</catalog>
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I want to loop through the nodes and process the nodes accordingly. If it's a car, I need to pass the car details to some function and if it's a bike then I need to pass the bike details to the other function.

The point is to process the nodes based on the node type (car or bike or other).

PHP

$z = new XMLReader;
$z->open('data.xml');

$doc = new DOMDocument;

// move to the first <product /> node
while ($z->read() && $z->name !== 'product');

// now that we're at the right depth, hop to the next <product/> until the end of the tree
while ($z->name === 'product')
{
    // either one should work
    //$node = new SimpleXMLElement($z->readOuterXML());
    $node = simplexml_import_dom($doc->importNode($z->expand(), true));

    // now you can use $node without going insane about parsing
    var_dump($node->element_1);

    // go to next <product />
    $z->next('product');
}
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The above PHP code works fine if the nodes are products. I need to work with different nodes.