PHP登录表单错误未定义索引: active

Question

您好，每当我在我的网站上按下登录按钮时，我都会收到此错误:

Notice: Undefined index: active in C:\xampp\htdocs\repute-multipurpose-theme-v1.3\theme\login.php on line 14

我想知道你们是否知道如何解决这个问题。我一直在阅读有关 isset 函数的内容，但我在第 14 行尝试了该函数，但它又出现了另一个错误，因此它似乎不起作用。

<?php
   include("config.php");
   session_start();

   if($_SERVER["REQUEST_METHOD"] == "POST") {
      // username and password sent from form 

      $myusername = mysqli_real_escape_string($conn,$_POST['username']);
      $mypassword = mysqli_real_escape_string($conn,$_POST['password']); 

      $sql = "SELECT customer_id FROM customer WHERE email_adress = '$myusername' and password = '$mypassword'";
      $result = mysqli_query($conn,$sql);
      $row = mysqli_fetch_array($result,MYSQLI_ASSOC);
      $active = $row['active'];

      $count = mysqli_num_rows($result);

      // If result matched $myusername and $mypassword, table row must be 1 row

      if($count == 1) {

         $_SESSION['login_user'] = $myusername;

         header("location: index2.php");
      }else {
         $error = "Your Login Name or Password is invalid";
      }
   }
?>

Answer 1

您尚未在查询中选择事件列。您只有 customer_id:

$sql = "SELECT customer_id FROM customer WHERE email_adress = '$myusername' and password = '$mypassword'";

此外，您很容易出现 SQL Injection 。

<小时/>

以防万一，您不知道 Undefined Index错误。