echo for循环到字符串

Question

我有一个for循环,我希望能够将结果回显成一个字符串.如何才能做到这一点？它只会将循环的最后一次运行回到我的变量中,以便在循环外使用.

for ($i = 0; $i < $numItem; $i++) {
            extract($cartContent[$i]);

        $pricebands = array("1"=>"$pd_price1","2"=>"$pd_price2","3"=>"$pd_price3","4"=>"$pd_price4","5"=>"$pd_price5","6"=>"$pd_price6");
        if(isset($loggedInfo['price'])){
            $priceToShow = $pricebands[$loggedInfo['price']];
        } else {
            $priceToShow = $pricebands[1];
        }
            $productUrl = "index.php?c=$cat_id&p=$pd_id";
            $subTotal += $priceToShow * $ct_qty;
            $pd_name;
            $ct_qty;
            $productList = "L_NAME".$i."=".$pd_name."&L_AMT".$i."=".$priceToShow."&L_QTY".$i."=".$ct_qty."&";   
        }
        $amount = $subTotal;           
    }

以及将$ productList放入的变量

   $nvpstr="&PAYMENTACTION=$paymentType&AMT=$amount&".trim($productList)."CREDITCARDTYPE=$creditCardType&ACCT=$creditCardNumber&EXPDATE=".$padDateMonth.$expDateYear."&CVV2=$cvv2Number&FIRSTNAME=$firstName&LASTNAME=$lastName&STREET=$address1&CITY=$city&STATE=$state&ZIP=$zip&COUNTRYCODE=$countryCode&CURRENCYCODE=$currencyCode";

Answer 1

每次循环时都要重置$ productList.你想添加它,而不是设置它:

$productList .= 'new stuff...';

在循环之前,将变量设置为空字符串,您将在其中添加更多字符:

$productList = '';