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Basically, for a small project I'm doing, I wanted a flatfile log in code for entry. So, I set up this. The problem is, in index.htm (the first code), when I press submit, even if the values are right, it just says 'login failed' on login.php (the second code). Here are the codes:

 

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><style type="text/css">
<!--
body,td,th {
font-family: Verdana, Arial, Helvetica, sans-serif;
}
-->
</style></head>
<body>
<center>
<table border="0" cellspacing="5" cellpadding="5">
<form action="login.php" method="POST">
<tr>
  <td>Username</td>
  <td><input type="text" size="10" name="f_user"></td>
</tr>
<tr>
  <td>Password</td>
  <td><input type="password" size="10" name="f_pass"></td>
</tr>
<tr>
  <td colspan="2" align="center"><input type="submit" name="submit" value="Log In">
</td>
</tr>
</form>
</table>
<p>Not a member? (<a href="register.php">register</a>)</p>
</center>
</body>
</html>

 

<?php

// authenticate using form variables
$status = authenticate($f_user, $f_pass);
// if  user/pass combination is correct
if ($status == 1)
{
// initiate a session
session_start();
// register some session variables
session_register("SESSION");

// including the username
session_register("SESSION_UNAME");
$SESSION_UNAME = $f_user;

// redirect to protected page
header("Location: secure_page.php");
exit();
}
else
// user/pass check failed
{
// redirect to error page
echo "Login failed!";
exit();
}


// authenticate username/password against usersdb
// returns: -1 if user does not exist
//           0 if user exists but password is incorrect
//           1 if username and password are correct
function authenticate($user, $pass)
{
  $result = -1;

  // make sure that the script has permission to read this file!
  $data = file("userdb.txt");

  // iterate through file
  foreach ($data as $line)
  {
     $arr = explode(" | ", $line);
     // if username matches
     // test password
     if ($arr[1] == $_POST['f_user'])
     {
        // if match, user/pass combination is correct
        // return 1
        if ($arr[2] == md5($_POST['f_pass']))
        {
           $result = 1;
           break;
        }
        // otherwise return 0
        else
        {
           $result = 0;
           break;
        }
     }

  }
  // return value
  return $result;
}

?>

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https://forums.phpfreaks.com/topic/67228-solved-flat-php-login-not-working/
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Refrain from using session_register it is deprecated instead use $_SESSION["variablename"] = "value";

 

Should $arr[1] and $arr[2] be $arr[0] and $arr[1] as after exploding element keys start at 0.

 

If that doesn't fix it, please show us what your userdb file looks like in structure.

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