使用foreach循环将值插入数据库

Question

我在使用foreach循环将值插入数据库时​​遇到了问题。插入的值为0，只插入一行。 以下是我的输入代码。

<td bgcolor="#FFFFFF"><input id="id" name="pro_id[]" type="text"></td> 
<td bgcolor="#FFFFFF"><input id="name" name="pro_name[]" type="text"></td> 
<td bgcolor="#FFFFFF"><input id="quan" name="pro_quan[]" type="text"></td> 

下面是我的插入代码..

if (isset($_POST['Submit'])) { 
$username = $_SESSION['admin_id']; 

foreach ($_SESSION["products"] as $item) 
{ 
    $ids = $item["pro_id"]; 
    $names = $item["pro_name"]; 
    $quans = $item["pro_quan"]; 

} 

$query = "INSERT INTO product(username, pro_id, pro_name, pro_quan) VALUES ('$username', '$ids', '$names', '$quans')"; 
$result = mysqli_query($con, $query); 
if($result) 
{ 
    header("Location:delete.php"); 
} 
else 
{ 
    mysqli_error($con); 
} 
} 

插入只会为0的值，我不知道什么是错误在这里。请帮我看看我的代码出了什么问题。感谢您的帮助

Answer 1

好的现场@JayBlanchard关于会话开始。 您必须检查产品的循环继续之前的会话阵列

#start up session 
    if(!isset($_SESSION)){ 
     session_start(); 
     } 
#for debugging purposes. Comment the line below when done. 
var_dump($_SESSION['products']); 
     try{ 

     if (isset($_POST['Submit'])) { 
      $username = $_SESSION['admin_id']; 
      #verify that the product array in session is not empty 
      if(!empty($_SESSION['products']) && count($_SESSION['products']) > 0){ 
       foreach ($_SESSION["products"] as $item) 
       { 
       $ids = $item["pro_id"]; 
       $names = $item["pro_name"]; 
       $quans = $item["pro_quan"]; 

       }else{ 
        throw new Exception('no products for this session'); 
       } 
      } 

      $query = "INSERT INTO product(username, pro_id, pro_name, pro_quan) VALUES ('$username', '$ids', '$names', '$quans')"; 
      $result = mysqli_query($con, $query); 
      if($result) 
      { 
       header("Location:delete.php"); 
      } 
      else 
      { 
       mysqli_error($con); 
      } 
      } 

     }catch(Exception $ex){ 
     echo $ex->getMessage(); 
     exit; 
     }