Php SQL查询未显示超过1行

这是查询3或查询4中出现错误的全部代码。正如您所看到的，查询3只是获取了构建查询4的信息，该查询应该返回结果

我有查询1和查询2工作正常，有正确的数据显示

<?php
session_start();
//printf('<pre>%s</pre>', print_r($_SESSION, true));
require('includes/config.inc.php');
require('includes/session.php');

//WORKING
DB_Connect();
$query = "SELECT * FROM food_delivery_orders_items WHERE food_delivery_orders_items.type = 'product' AND food_delivery_orders_items.order_id=".$_SESSION['pdf_quote']['id']."";

$result = mysql_query( $query) or die(mysql_error());

while($row = mysql_fetch_array($result)) 
            {
         $hash = $row['hash'];
         $foreignid = $row['foreign_id'];
          $qty = $row['cnt'];                   
            }


$query2 = "SELECT * FROM food_delivery_products WHERE food_delivery_products.id = ".$foreignid."";

$result2 = mysql_query( $query2) or die(mysql_error());

while($row = mysql_fetch_array($result2)) 
            {
         $name = $row['name'];
         $description = $row['description'];                
            }



    //---------------------------------------------------------------------------------------------------------------

    $query3 = "SELECT * FROM food_delivery_orders_items WHERE food_delivery_orders_items.type = 'extra' AND food_delivery_orders_items.order_id=".$_SESSION['pdf_quote']['id']."";

$result3 = mysql_query( $query3)or die(mysql_error()) ;

while($row = mysql_fetch_array($result3)) 
            {

         $foreignidextra = $row['foreign_id'];  
         $qtyextra = $row['cnt'];           

            }


            $query4 = "SELECT * FROM food_delivery_extras WHERE food_delivery_extras.id = ".$foreignidextra."";

$result4 = mysql_query( $query4) or die(mysql_error());

while($row = mysql_fetch_array($result4)) 

            {
         $nameextra = $row['name'];

            }

    echo $nameextra;
    echo $qtyextra;

DB_Disconnect();





//$products = implode(", ",$_SESSION['pdf_quote']['product_arr']);;

//print $products
?>

---

打印$row仅在循环内有效。否则，它将只打印最后一行。成功

$query3 = "SELECT * FROM food_delivery_orders_items WHERE food_delivery_orders_items.type = 'extra' AND food_delivery_orders_items.order_id=".$_SESSION['pdf_quote']['id']."";

$result3 = mysql_query( $query3) ;

while($row = mysql_fetch_array($result3)) 
{
    $foreignidextra = $row['foreign_id'];   
    $qtyextra = $row['cnt']; 
    print_r($row);           
}

这是因为在执行
循环时，在
之后打印
$row

所以它只打印最终结果集

改用类似的方式：

您还可以使用
var\u dump（$row）而不是打印（$row）

每次循环迭代时，这将输出存储在
$row
数组中的所有值，或者您不仅要覆盖循环中的这两个变量，而且还要在循环结束后打印$row。是否尝试使用
var\u dump（$result3）
对其进行调试？
$query3 = "SELECT * FROM food_delivery_orders_items WHERE food_delivery_orders_items.type = 'extra' AND food_delivery_orders_items.order_id=".$_SESSION['pdf_quote']['id']."";

$result3 = mysql_query( $query3) ;

while($row = mysql_fetch_array($result3)) 
{
    $foreignidextra = $row['foreign_id'];   
    $qtyextra = $row['cnt']; 
    print_r($row);           
}