image-count.php

<?php

// fetches a file and returns an XML document
$xml = simplexml_load_file("http://search.cdsonline.com.au/offsite/xmlStock.asp?dlr=wesmotperf");

// loads the XML into the DOM
$dom1 = new DomDocument();
$dom1->loadXML($xml->asXML());

// Sets up an object so we can use xpath to query for nodes of the XML document
$xpath = new domXPath($dom1);

// Queries for <stocklist><vehicle>, each vehicle is wrapped in a vehicle tag
$xpathQuery = $xpath->query('/stocklist/vehicle');

// Sets the MIME type for the data we're outputting so the browser knows how to handle it
header('Content-type: application/xml');

// Send the opening root tag; this contains all of the "records" essentially
echo "<stocklist>";

// Loop through the vehicle nodes
foreach($xpathQuery as $vehicle) {
    // Fetch the stock number for the vehicle
    $stk_number = $vehicle->getElementsByTagName('stk');
    
    // Fetch the number of image tags that are children of the vehicle node
    $image_count = $vehicle->getElementsByTagName('image')->length;

    // Send an opening vehicle tag
    echo "<vehicle>";
    
    // Send the stock number
    echo "<stk>" . $stk_number->item(0)->nodeValue . "</stk>";
    
    // Send the photo count
    echo "<photos>$image_count</photos>";
    
    // Send the closing vehicle tag
    echo "</vehicle>";
}

// Send the closing stocklist tag
echo "</stocklist>";

?>