INDEX UNDEFINED

[manch889]

<?php
require 'config.php';
if (isset($_POST['login'])) {

  $password = mysqli_real_escape_string($con, $_POST['tpw']);
  $username=  mysqli_real_escape_string($con, $_POST['username']);
   
  
      $query = "SELECT * FROM tinfo WHERE username='$username' AND password='$password'";
      $results = mysqli_query($con, $query);
      if (mysqli_num_rows($results) == 1) {
        $_SESSION['username'] = $username;
          $_SESSION['success'] = "You are now logged in";
        header('location: ../html/register.html');
      }else {
          echo "Wrong username/password combination";
      }
  
  
}
?>

[cyberRobot]

Which "index" does the error message refer to? What is the error message?

Side note: if you're not doing so already, you'll want to look into password security. More information can be found here:
https://www.php.net/manual/en/faq.passwords.php

Edited October 22, 2020 by cyberRobot

[manch889]

Notice: Undefined index: username in C:\xampp\htdocs\IWT Assigment - Copy\php\tlogin.php on line 6

[cyberRobot]

What does your form code look like?

[manch889]

<form method="post" action="../php/tlogin.php" name="form" onsubmit="return validated()" ><br></br>

<lable> Username</lable>
<input type="text"  placeholder="Enter Username" name="username" id="uname" required>
<div id="uname_error">Please Fill Up your Username</div>
 <br></br>

<lable>Password</lable>  
<input type="password" placeholder="Enter Password" name="tpw" id="tpw" required><br></br>
<div id="pass_error">Please Fill Up your Password</div>
<br></br>

<button type="Submit" name="login">Login</button><br></br>

<a href="#">Lost Your Password?</a><br>
<a href="#">Don't have an account?</a>
</form>

[cyberRobot]

Try adding the following echo statement inside your if construct to see what $_POST contains:

if (isset($_POST['login'])) {

    echo '<pre>' . print_r($_POST, true) . '</pre>';

After adding the line, try submitting the form, but don't use a real login. Just enter random characters. What does the output look like? Note that you're looking for output like the following (please don't post real usernames/passwords):

Array
(
    [tpw] => sdflaje
	...
)