未定义的索引PHP错误

问题描述

我一直在尝试使用000webhost创建一个登录页面，并且这个错误不断出现，我知道这些问题有大量的问题，但我还是无法修复它



这是错误



注意：未定义的索引：在/storage/ssd1/326/5052326/public_html/login.php上有效14



警告：无法修改标题信息 - 已经发送的标题（输出从/storage/ssd1/326/5052326/public_html/login.php:14开始）第23行/storage/ssd1/326/5052326/public_html/login.php



这是代码

I've been trying to make a login page with 000webhost, and this error keeps popping up, and i know there are tons of these king of questions everywhere but i still cant fix it

this is the error

Notice: Undefined index: active in /storage/ssd1/326/5052326/public_html/login.php on line 14

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/326/5052326/public_html/login.php:14) in /storage/ssd1/326/5052326/public_html/login.php on line 23

and this is the code

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

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

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

      $sql = "SELECT * FROM admin WHERE username = '$myusername' and password = '$mypassword'";
      $result = mysqli_query($db, $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: welcome.php");
      }else {
         $error = "Your Login Name or Password is invalid";
      }
    }
?>

我尝试了什么：



即使我的老师也无法修复它

What I have tried:

even my teacher couldnt fix it

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