Question

about Header in PHP

Asked by: tom_mk

hi, this is the code of mine.
some i got it from this site ( http://www.phpfreaks.com/tutorials/77/1.php )
it's a tut about 'Customized Timeout Sessions'

i am trying to incoperate tat site code with mine. but i have very little knowleage about header thingly.
and i not sure what i did wrong here.

any suggestion would be appreciate, and some comment on how header works would be great.
what i know now about header is, we use header to redirect to other site, or pop user for a file to download.

anyway, this is my code,
and this is the error i received from firefox when i tried to run the code.
------------------------------------------------------------------------------------------------------------------------------------------------------
redirection limit for this URL exceeded. unable to load the requestes page. this may by caused by cookies that area blocked.
--------------------------------------------------------------------------------------------------------------------------------------------------------

code
-----------------

<?php

session_start();
header("Cache-control: private"); //IE 6 Fix

$username = null;

function validate_user($username, $password)
{
      if(($username == 'admin') and ($password = 'admin'))
      {
            return true;
      }
      else
      {
            return false;
      }
}

if (($username != null) && ($password != null ))
{
      if (validate_user($username,$password) == true)
      {
//session_start();
//session_register('username'); // not good due to security reason
            //session_register('password');

            $username      = $_POST['name'];
            $password      = $_POST['password_field'];

            $_SESSION['name'] = $username;
            $_SESSION['password'] = $password;

            $sess_id = session_id();
header("Location: index.php?PHPSESSID=$sess_id&new_login=1");
exit;
}
      else
      {
$message = urlencode("<b>ERROR:</b> Username does not exist.");
header("Location: session1.php?message=$message");
exit;
}
}
else
{
$message = urlencode("<b>ERROR:</b> You must enter a username and password to enter.");
      header("Location: session1.php?message=$message");
      exit;
}

?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Untitled Document</title>
</head>

<body>
<form name="form1" method="post" action="session1.php">
<table width="232" height="94" border="0">
<tr>
<td width="76" valign="bottom">Username </td>
<td colspan="3"><input name="name" type="text" id="name_filed"></td>
</tr>
<tr>
<td valign="bottom"><br>
Password </td>
<td colspan="3"><input type="password" name="password_field"></td>
</tr>
<tr>
<td rowspan="2"> </td>
<td colspan="2"><input type="checkbox" name="checkbox" value="checkbox">
remember me?</td>
<td width="49" rowspan="2"> </td>
</tr>
<tr>
<td width="46"><input name="enter_button" type="submit" id="enter_button" value="Enter"></td>
<td width="98"><input name="reset_button" type="reset" id="reset_button" value="Reset"></td>
</tr>
</table>
</form>

<a href = "session2.php"> GO2- ession2 </a>

</body>
</html>

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Asked On: 2005-06-29 at 20:19:14ID21475811
Tags: gb2312
Topic: PHP Scripting Language
Participating Experts: 1
Points: 500
Comments: 6

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Answers

by: ravikiran_mullangiPosted on 2005-06-29 at 22:58:08ID: 14335743

This is because

the else part (i hope your have given the file name session1.php to the above code)

else
{
$message = urlencode("<b>ERROR:</b> You must enter a username and password to enter.");
header("Location: session1.php?message=$message");
exit;
}

when ever your trying to access the page first time, it means the $username and $password are null,

so that this part of code executes ever time this page loads, it redirects to same page (session1.php) again and again this repeats....

by: tom_mkPosted on 2005-06-29 at 23:06:29ID: 14335763

can u suggest me of how to fix this?

by: tom_mkPosted on 2005-06-30 at 00:26:20ID: 14336006

i tried making some change,
and this is wat i received from FIREFOX
------------------------

Notice: Undefined index: username_field in c:\program files\easyphp1-8\www\blog\test\session1.php on line 29

Notice: Undefined index: password_field in c:\program files\easyphp1-8\www\blog\test\session1.php on line 30

Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\blog\test\session1.php:29) in c:\program files\easyphp1-8\www\blog\test\session1.php on line 56
------------
i've marked line number on the code below
-------------------
<?php

//session_start();
//header("Cache-control: private"); //IE 6 Fix

// header example
// -------------------------------------------------------------------
// header("Location: http://www.example.com/"); to redirect
// header("HTTP/1.0 404 Not Found");
// header("Content-Disposition: attachment; filename=doc.pdf");

//echo "Session ID : ".session_id()."<br>";

//echo "msg : " . $_GET['message'] . "<br>";

function validate_user($username, $password)
{
      if(($username == 'admin') and ($password = 'admin'))
      {
            return true;
      }
      else
      {
            return false;
      }
}

$username = trim($_POST['username_field']); //LINE 29
$password = trim($_POST['password_field']); // LINE 30

if (($username) AND ($password))
{
      if (validate_user($username,$password) == true)
      {
session_start();

            $_SESSION['name'] = trim($_POST['username_field']);
            $_SESSION['password'] = trim($_POST['password_field']);

            $sess_id = session_id();

header("Location: index.php?PHPSESSID=$sess_id&new_login=1");
exit;
}
      else
      {
$message = urlencode("<b>ERROR:</b> Username does not exist.");
header("Location: session1.php?message=$message");
exit;
}
}
else
{
$message = urlencode("<b>ERROR:</b> You must enter a username and password to enter.");
      header("Location: session1.php?message=$message"); //LINE 56
      exit;
}

?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Untitled Document</title>
</head>

<body>
<form name="form1" method="post" action="session1.php">
<table width="232" height="94" border="0">
<tr>
<td width="76" valign="bottom">Username </td>
<td colspan="3"><input name="username_field" type="text" id="name_filed"></td>
</tr>
<tr>
<td valign="bottom"><br>
Password </td>
<td colspan="3"><input type="password" name="password_field"></td>
</tr>
<tr>
<td rowspan="2"> </td>
<td colspan="2"><input type="checkbox" name="checkbox" value="checkbox">
remember me?</td>
<td width="49" rowspan="2"> </td>
</tr>
<tr>
<td width="46"><input name="enter_button" type="submit" id="enter_button" value="Enter"></td>
<td width="98"><input name="reset_button" type="reset" id="reset_button" value="Reset"></td>
</tr>
</table>
</form>

<a href = "session2.php"> GO2- ession2 </a>

</body>
</html>

by: tom_mkPosted on 2005-06-30 at 01:25:00ID: 14336251

i solved it already.

Tom

by: ravikiran_mullangiPosted on 2005-06-30 at 01:27:06ID: 14336260

Hi

I have modified your code a little bit... execute this and let me know if you still have any problem

Thanks
Ravi kiran

<?php

//session_start();
//header("Cache-control: private"); //IE 6 Fix

// header example
// -------------------------------------------------------------------
// header("Location: http://www.example.com/"); to redirect
// header("HTTP/1.0 404 Not Found");
// header("Content-Disposition: attachment; filename=doc.pdf");

//echo "Session ID : ".session_id()."<br>";

//echo "msg : " . $_GET['message'] . "<br>";

function validate_user($username, $password)
{
if(($username == 'admin') and ($password = 'admin'))
{
return true;
}
else
{
return false;
}
}

$username = trim($_POST['username_field']); //LINE 29
$password = trim($_POST['password_field']); // LINE 30
$ispost = trim($_POST['enter_button']); // LINE added by Ravikiran

if($ispost == 'Enter') { // If condition added by Ravikiran

      if (($username) AND ($password))
      {
             if (validate_user($username,$password) == true)
             {
                  session_start();

                   $_SESSION['name'] = trim($_POST['username_field']);
                   $_SESSION['password'] = trim($_POST['password_field']);

                   $sess_id = session_id();

                  header("Location: index.php?PHPSESSID=$sess_id&new_login=1");
                  exit;
            }
             else
             {
                  $message = urlencode("<b>ERROR:</b> Username does not exist.");
                  header("Location: session1.php?message=$message");
                  exit;
            }
      }
      else
      {
            $message = urlencode("<b>ERROR:</b> You must enter a username and password to enter.");
             header("Location: session1.php?message=$message"); //LINE 56
             exit;
      }
}

?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Untitled Document</title>
</head>

<body>
<form name="form1" method="post" action="session1.php">
<table width="232" height="94" border="0">

      <tr>
<td colspan="4"><? echo $message;?></td>
</tr>
       
<tr>
<td width="76" valign="bottom">Username </td>
<td colspan="3"><input name="username_field" type="text" id="name_filed"></td>
</tr>
<tr>
<td valign="bottom"><br>
Password </td>
<td colspan="3"><input type="password" name="password_field"></td>
</tr>
<tr>
<td rowspan="2"> </td>
<td colspan="2"><input type="checkbox" name="checkbox" value="checkbox">
remember me?</td>
<td width="49" rowspan="2"> </td>
</tr>
<tr>
<td width="46"><input name="enter_button" type="submit" id="enter_button" value="Enter"></td>
<td width="98"><input name="reset_button" type="reset" id="reset_button" value="Reset"></td>
</tr>
</table>
</form>

<a href = "session2.php"> GO2- ession2 </a>

</body>
</html>

by: ravikiran_mullangiPosted on 2005-06-30 at 01:33:24ID: 14336288

many thanks tom
this is the first time i have received expert points.

20120131-EE-VQP-002

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about Header in PHP

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gb2312

PHP Scripting Language

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