我已经研究了一段时间,似乎找不到代码的问题。我试图得到一件物品的价格,如果有价格,这很有效,但如果价格不见,就会出错
这是代码:
/* 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);
我检查子节点的功能是:
function xml_child_exists($xml, $childpath)
{
$result = $parsed_xml->xpath($childpath);
if (count($result)) {
return true;
} else {
return false;
}
}
尝试检查子节点是否存在
function xml_child_exists($xml, $childpath)
{
//$result = $parsed_xml->xpath($childpath); $parsed_xml variable?
$result = $xml->xpath($childpath);
if (isset($result)) { // changed from count to isset
return TRUE;
} else {
return FALSE;
}
}
使用property_exists()我使用它来检查重复的子项,同时使用SimpleXML将新的子项添加到xml中。它应该对你有用。如果您只传入子名称及其父名称。
function xml_child_exists($xml, $child)
{
return property_exists($xml, $child);
}