php login works on XAMPP but not web server?

Question

I am trying to add a simple login to a website and had it working perfectly on my localhost XAMPP server but now when uploaded to my website I am able to register new users but when I go to login the page just goes blank.

 <?php
$error = '';
if (isset($_POST['login'])) {
    session_start();
    $username = trim($_POST['username']);
    $password = trim($_POST['pwd']);
    // location to redirect on success
    $redirect = './adminArea_db.php';
    require_once('./includes/authenticate_pdo.inc.php');
}
?>
 <!DOCTYPE HTML>
 <html>
 <link href="css/screen.css" rel="stylesheet" media="screen" />
    <meta charset="utf-8">
    <title>Login</title>
</head>

 <body>
 <div id="main">
<?php
 if ($error) {
 echo "<p>$error</p>";
 } elseif (isset($_GET['expired'])) { 
?>
 <p>Your session has expired. Please log in again.</p>
 <?php } ?>
 <form id="form1" method="post" action="">
   <p>
    <label for="username">Username:</label>
    <input type="text" name="username" id="username" value="">
    </p>
     <p>
    <label for="pwd">Password:</label>
    <input type="password" name="pwd" id="pwd">
     </p>
     <p>
    <input name="login" type="submit" id="login" value="Log in">
   </p>
    </form>
   </div>
     </body> 
    </html>

Any ideas?

Found some errors in my error_log, not sure if useful?

[11-Feb-2014 20:48:52 Europe/London] PHP Warning:  session_start()   [<ahref='function.session-start'>function.session-start</a>]: Cannot send session cookie - headers already sent by (output started at /home/georgepa/public_html/login_db.php:2) in /home/georgepa/public_html/login_db.php on line 6
[11-Feb-2014 20:48:52 Europe/London] PHP Warning:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home/georgepa/public_html/login_db.php:2) in /home/georgepa/public_html/login_db.php on line 6
[11-Feb-2014 20:48:52 Europe/London] PHP Warning:  session_regenerate_id() [<a href='function.session-regenerate-id'>function.session-regenerate-id</a>]: Cannot regenerate session id - headers already sent in /home/georgepa/public_html/includes/authenticate_pdo.inc.php on line 28
[11-Feb-2014 20:48:52 Europe/London] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/georgepa/public_html/login_db.php:2) in /home/georgepa/public_html/includes/authenticate_pdo.inc.php on line 29

Think there is a problem with my authenticate_pdo.inc.php file...

  <?php
   require_once('./includes/connection.inc.php');
   $conn = dbConnect();
    // get the username's details from the database
    $sql = 'SELECT salt, pwd FROM users WHERE username = :username';
    // prepare statement
     $stmt = $conn->prepare($sql);
     // bind the input parameter
     $stmt->bindParam(':username', $username, PDO::PARAM_STR);
     // bind the result, using a new variable for the password
      $stmt->bindColumn(1, $salt);
     $stmt->bindColumn(2, $storedPwd);
       try{
       $stmt->execute();
       $stmt->fetch();
      }catch(PDOException $e){
       exit('problem reading from table users'.$e->getMessage());
      }

       dbClose($conn) ;
       // encrypt the submitted password with the salt and compare with stored password
       if (sha1($password . $salt) == $storedPwd) {
        $_SESSION['authenticated'] = 'admin'; // role of authenticated user
         $_SESSION['username']=$username;
         // get the time the session started
         $_SESSION['start'] = time();
         session_regenerate_id();
         header("Location: $redirect");
         exit;
        } else {
        // if no match, prepare error message
         $error = 'Invalid username or password';
        } 
      ?>

Look here: stackoverflow.com/questions/6575482/… and stackoverflow.com/questions/6127980/… — ozahorulia
– ozahorulia, Commented Feb 9, 2014 at 20:02
Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request. — user3010383
– user3010383, Commented Feb 9, 2014 at 20:06
This doesn't change enything. You need to get exact error message instead of 500 server error. Try this: stackoverflow.com/questions/2687730/… — ozahorulia
– ozahorulia, Commented Feb 9, 2014 at 20:13

Community · Accepted Answer · 2023-11-17 20:24:09Z

1

session_start() as well as session_regenerate_id() should be put at the start of the php script before any other output.

As it is not always possible you can set up output buffering by putting ob_start() at the beginning of your program.

It might be helpful for you to read these articles:

edited Nov 17, 2023 at 20:24

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answered Feb 12, 2014 at 13:07

ozahorulia

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Comments

tjati · Accepted Answer · 2014-02-14 15:12:51Z

0

Remove any blanks before <?php.

answered Feb 14, 2014 at 15:12

tjati

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