我正在运行两个几乎相同的程序，只是一个只需要查看最低价格，另一个需要查看最低的4个价格并获得平均值。我的问题是，当运行第二个程序时，我得到了一个内存不足的php致命错误。我的主机提供商已将我的内存限制设置为3000M，但我仍然会收到错误。这是第一个程序的代码：
$parsed_xml = amazon_xml($isbn);
$current = $parsed_xml->ListMatchingProductsResult->Products->Product;
$asin = $current->Identifiers->MarketplaceASIN->ASIN;
//print_r($asin);
// get information based on the items ASIN
$price_xml = amazonPrice_xml($asin, $ItemCondition);
$currentPrice = $price_xml ->GetLowestOfferListingsForASINResult->Product->LowestOfferListings->LowestOfferListing;
$listPrice = $currentPrice->Price->ListingPrice->Amount;
// check to see if there are values
if(!empty($listPrice))
{
//print_r($listPrice); die;
//if($currentPrice->Price->ListingPrice->Amount > 0) {
while(count($lowestPrices) < 2)
{
foreach($currentPrice as $offer){
$totalFeedback = $offer->SellerFeedbackCount;
$condition = $offer->Qualifiers->ItemSubcondition;
//amazon condition matching algorithm (so we can match our condition up against amazons conditions)
switch ($condition) {
case "New":
$amazonCondition = 5;
break;
case "Mint":
$amazonCondition = 4;
break;
case "VeryGood":
$amazonCondition = 3;
break;
case "Good":
$amazonCondition = 2;
break;
case "Acceptable":
$amazonCondition = 1;
break;
default:
$amazonCondition = 0;
} // end of switch statement
//echo $condition . "|" . $ourCondition . "|" . $amazonCondition . "|" . count($lowestPrices) . "|" . $totalFeedback . "|" . $merchantId . "<br/>";
/* default lowest 1 */
if(count($lowestPricesDefault[$a] <2)){
$lowestPricesDefault[$a] = str_replace('$','',$offer->Price->ListingPrice->Amount);
$a++;
}
if( ($ourCondition <= $amazonCondition) && ($totalFeedback >= 1500) && (count($lowestPrices) <2) )
{
$lowestPrices[$x] = str_replace('$','',$offer->Price->ListingPrice->Amount);
$x++;
}
}
$z++;
}
if(count($lowestPrices) > 0){
$avgPrice = (array_sum($lowestPrices)/count($lowestPrices)) - .10;
$source = "Amazon Condition Price";
}else{
//$avgPrice = $listPrice - ($listPrice * 0.25);
$avgPrice = (array_sum($lowestPricesDefault)/count($lowestPricesDefault)) - .10;
$source = "Default Pricing";
}
//make sure avg price is atleast 5.50, >236% of follett price, and >=200% of our cost
if($avgPrice < ($follettPrice * 2.37)){
$avgPrice = $follettPrice * 2.37;
$source = "Follett Pricing";
}
if($avgPrice < ($row['cost'] * 2)){
$avgPrice = $row['cost'] * 2;
$source = "Double Cost";
}
if($avgPrice < 5.50){
$avgPrice = 5.50;
$source = "Lowest Base Cost";
}
//update Prices
$conn->query("UPDATE inventory SET ourPrice = $avgPrice WHERE sku=" . $row['sku']);
这是第二个程序：
$parsed_xml = amazon_xml($isbn);
$current = $parsed_xml->ListMatchingProductsResult->Products->Product;
$asin = $current->Identifiers->MarketplaceASIN->ASIN;
// get information based on the items ASIN
$price_xml = amazonPrice_xml($asin, $ItemCondition);
$currentPrice = $price_xml ->GetLowestOfferListingsForASINResult->Product->LowestOfferListings->LowestOfferListing;
$listPrice = $currentPrice->Price->ListingPrice->Amount;
// check to see if there are values
if(!empty($listPrice))
{
//if($price_xml) {
while(count($lowestPrices) < 4 ) // changed count to 4 per loralee's email 5-1-2012
{
foreach($currentPrice as $offer){
$totalFeedback = $offer->SellerFeedbackCount;
$condition = $offer->Qualifiers->ItemSubcondition;
//amazon condition matching algorithm (so we can match our condition up against amazons conditions)
switch ($condition) {
case "New":
$amazonCondition = 5;
break;
case "Mint":
$amazonCondition = 4;
break;
case "VeryGood":
$amazonCondition = 3;
break;
case "Good":
$amazonCondition = 2;
break;
case "Acceptable":
$amazonCondition = 1;
break;
default:
$amazonCondition = 0;
}
//echo $condition . "|" . $ourCondition . "|" . $amazonCondition . "|" . count($lowestPrices) . "|" . $totalFeedback . "|" . $merchantId . "<br/>";
/* default lowest 4 */
if(count($lowestPricesDefault[$a] < 4)){ //changed to 4 per new pricing specs
$lowestPricesDefault[$a] = str_replace('$','',$offer->Price->ListingPrice->Amount);
$a++;
}
if( ($ourCondition <= $amazonCondition) && ($totalFeedback >= 99) && (count($lowestPrices) < 4) ) //changed to 4 per new pricing specs
{
$lowestPrices[$x] = str_replace('$','',$offer->Price->ListingPrice->Amount);
$x++;
}
}
$z++;
}
if(count($lowestPrices) > 0){
$avgPrice = array_sum($lowestPrices)/count($lowestPrices);
$source = "Amazon Condition Price";
}else{
//$avgPrice = $listPrice - ($listPrice * 0.25);
$avgPrice = array_sum($lowestPricesDefault)/count($lowestPricesDefault);
$source = "Default Pricing";
}
//make sure avg price is atleast 5.50, >236% of follett price, and >=200% of our cost
if($avgPrice < ($follettPrice * 2.37)){
$avgPrice = $follettPrice * 2.37;
$source = "Follett Pricing";
}
if($avgPrice < ($row['cost'] * 2)){
$avgPrice = $row['cost'] * 2;
$source = "Double Cost";
}
if($avgPrice < 5.50){
$avgPrice = 5.50;
$source = "Lowest Base Cost";
}
//update fillzPrice
$conn->query("UPDATE inventory SET ourPrice = $avgPrice WHERE sku=" . $row['sku']);
我在第二个程序的第86行收到了错误，即条件行（$condition=$offer->Qualifiers->ItemSubcondition；）有人知道为什么会发生这种情况吗？此外，有人有什么建议可以让它运行得更好吗？
首先，两个代码审查点：
- 您有变量
$a、$x和$z，它们都没有初始条件，对任何试图维护代码的人来说都是完全不透明的。一个单独的$i作为循环计数器通常被认为是可以接受的，但良好的变量命名可以使调试变得容易得多 - 使用SimpleXML时，始终将值强制转换为字符串：
$asin = $current->Identifiers->MarketplaceASIN->ASIN;应读取$asin = (string)$current->Identifiers->MarketplaceASIN->ASIN;。除其他外，忘记执行此操作将意味着$asin永远无法保存到会话中（因为SimpleXML对象无法序列化）
至于你的代码为什么失败，我认为你的循环结构是错误的：
while(count($lowestPrices) < 4 )
{
foreach($currentPrice as $offer)
{
// Do something which may add to `$lowestPrices`
$z++;
}
}
首先，$z似乎没有用于任何用途。其次，$lowestPrices可以在foreach循环内被添加到0、1、4、甚至100次。如果添加到至少4次，while循环将立即退出（因此可能不存在）；如果它被添加到少于4次，则foreach循环将简单地在相同的数据上再次运行。我不清楚这是否会使它更有可能满足while循环的条件，给你一个无限循环。
内存不足，而不仅仅是CPU时间不足的原因是，即使$lowestPrices没有，额外的数组$lowestPricesDefault也会增长，因此每次while循环（因此整个内部foreach循环）重复时，它都会无限期地增长。