Question

I have been researching this for a while and can’t seem to find the problem with my code. I am attempting to get the price of an item and this works great if there is a price, but if the price is missing it throws an error.
Here is the code:

    /* Amazon Offers ALGORITHM */
$parsed_xml = amazon_xml($isbn);

$current = $parsed_xml->ListMatchingProductsResult->Products->Product;
$asin = $current->Identifiers->MarketplaceASIN->ASIN;

// get information based on the items ASIN
$price_xml = amazonPrice_xml($asin);
    if($price_xml) {
    while(count($lowestPrices) < 2)
    {

        // check to see if there are values
        if(xml_child_exists($parsed_xml, $current->AttributeSets->children('ns2', true)->ItemAttributes->ListPrice->Amount))
           { 
            $listPrice = $current->AttributeSets->children('ns2', true)->ItemAttributes->ListPrice->Amount;
          } else {
            $listPrice = 0;
          }
        $currentPrice = $price_xml ->GetLowestOfferListingsForASINResult->Product->LowestOfferListings->LowestOfferListing;
        print_r($listPrice); 

My function to check for child nodes is:

    function xml_child_exists($xml, $childpath)
{
$result = $parsed_xml->xpath($childpath);
if (count($result)) {
    return true;
} else {
    return false;
}
}

Answer 1

try this to check if child node exists

function xml_child_exists($xml, $childpath)
 {
  //$result = $parsed_xml->xpath($childpath); $parsed_xml variable?
    $result = $xml->xpath($childpath);
   if (isset($result)) { // changed from count to isset
    return TRUE;
   } else {
    return FALSE;
   }
}