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Old August 1st, 2008, 11:18 AM
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Default PHP Login Page errors - Please Solve and Help

Following are the errors that I get from the page that I have made for
Login and below I have attached the login.php file. I understand that
it has to do something with sessions but then I connot figure out how
to solve the problem. Your help will be appreciated. Please let me
know if you want me to post the other included files also.

Warning: session_start(): Cannot send session cookie - headers already
sent by (output started at C:\apache2triad\htdocs\paramarsh\regsys\lib
\common.php:35) in C:\apache2triad\htdocs\paramarsh\regsys\public_fil es
\login.php on line 8 Warning: session_start(): Cannot send session
cache limiter - headers already sent (output started at C:\apache2triad
\htdocs\paramarsh\regsys\lib\common.php:35) in C:\apache2triad\htdocs
\paramarsh\regsys\public_files\login.php on line 8 Warning: Cannot
modify header information - headers already sent by (output started at
C:\apache2triad\htdocs\paramarsh\regsys\lib\common .php:35) in C:
\apache2triad\htdocs\paramarsh\regsys\public_files \login.php on line



// include shared code
include '../lib/common.php';
include '../lib/db.php';
include '../lib/user.php';

// start or continue the session
header('Cache-control: private');

// perform login logic if login is set
if (isset($_GET['login']))
        if (isset($_POST['username']) && isset($_POST['password']))
                // retrieve user record
                $user = (User::validateUsername($_POST['username'])) ?
                User::getByUsername($_POST['username']) : new User();
                        if ($user->userId && $user->password == sha1($_POST['password']))
                                // everything checks out so store values in session to track the
                                // user and redirect to main page
                                $_SESSION['access'] = TRUE;
                                $_SESSION['userId'] = $user-> userId;
                                $_SESSION['username'] = $user-> username;
                                header('Location: main.php');
                                // invalid user and/or password
                                $_SESSION['access'] = FALSE;
                                $_SESSION['username'] = null;
                                header('Location: 401.php');
        // missing credentials
                $_SESSION['access'] = FALSE;
                $_SESSION['username'] = null;
                header('Location: 401.php');


// perform logout logic if logout is set
// (clearing the session data effectively logsout the user)
else if (isset($_GET['logout']))
        if (isset($_COOKIE[session_name()]))
                setcookie(session_name(), '', time() - 42000, '/');

        $_SESSION = array();


// generate login form

<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>?
login" method="post">
<td><label for="username"> Username </label></td>
<td><input type="text" name="username" id="username"/></td>
<td><label for="password"> Password </label></td>
<td><input type="password" name="password" id="password"/></td>
<td><input type="submit" value="Log In"/ ></td>
$GLOBALS['TEMPLATE']['content'] = ob_get_clean();
//display the page
include '../templates/template-page.php';


Old August 4th, 2008, 05:25 AM
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Send a message via Yahoo to v08i


This error is generated when you output anything to browser prior to session_start().
Check all your statements before session_start() and make sure that you dont have any tab, whitespace,echo or print statement before session_start().
This error will go away if you put session_start in the very first line.

Vijay Joshi

Old October 5th, 2008, 07:14 PM
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Join Date: Oct 2008
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look for empty spaces in paramarsh\regsys\lib\common.php:35 and login.php before <?php tag and remove if you found one, check for any echo or any thing which can do a print to response stream



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