Warning: Cannot modify header information - headers already sent by

zuko · October 31, 2008

I've just knocked up a quick login system using cookies and when I run my logout script I get this error:

Warning: Cannot modify header information - headers already sent by (output started at \var\www\web\header.php:9) in \var\www\web\login.php on line 31

here is my header.php script:

<?

session_start();

require_once "inc.php";

?>

<html>

<head>

<title>.: Video Streaming >></title>

<!--

.kiri {

background-repeat: repeat-y;

}

.kanan {

background-repeat: repeat-y;

width: 40px;

}

.tekssatu {

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 11px;

color: #FFFFFF;

}

.teksdua {

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 11px;

color: #000000;

}

.tekstiga {

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 10px;

color: #000000;

}

.tengah {

background-repeat: repeat-x;

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 10px;

color: #FFFFFF;

}

a:link,a:active,a:visited {

color : #FF6600;

text-decoration: none;

}

a:hover { text-decoration: underline; color : #FF0000; }

.mainmenu {

font-weight: bold;

font-size: 12px;

color : #006699;

text-decoration: none;

}

a.mainmenu { test-decoration: none; color : #006699; }

a.mainmenu:hover{ text-decoration: underline; color : #DD6900; }

input,textarea, select {

color : #000000;

font: normal 11px Verdana, Arial, Helvetica, sans-serif;

border: 1px #000000;

}

/* The text input fields background colour */

input.post, textarea.post, select {

background-color : #FFFFFF;

}

input { text-indent : 2px; }

/* The buttons used for bbCode styling in message post */

input.button {

background-color : #EFEFEF;

color : #000000;

font-size: 11px;

font-family: Verdana, Arial, Helvetica, sans-serif;

border: 1px solid #000000;

}

/* The main submit button option */

input.mainoption {

background-color : #FAFAFA;

font-weight : bold;

}

input.maindua {

background-color : #FAFAFA;

font-weight : bold;

border: 1px solid #000000;

}

.garis {

border: 1px solid #000000;

}

.judul {

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 13px;

font-weight: bold;

color: #FF6600;

text-decoration: none;

}

tr.header {

font-weight: bold;

border: solid #000000;

height: 20px;

bakground-color: #A6D2FF;

font-family: Verdana, Arial, Helvetica, sans-serif;

font-size: 13px;

color: #FF6600;

text-decoration: none;

}

-->

</style>

</head>

<tr>

<tr>

<td class="tengah" width="100%"><marquee direction="left" scrollamount="10" scrolldelay="200">Welcome to Adaptive Video Streaming with MPEG-4 Encoding</marquee></td>

</tr>

</table></td>

</tr>

<tr>

<tr>

</tr>

</table></td>

</tr>

<tr>

<tr>

<tr>

</tr>

<tr>

<? if (emptyString($_COOKIE[id])){ ?>

<div class="tekssatu">Username : <br>

<br>

Password : <br>

<input type="submit" value="login >>" class="button">

</div>

</form>

<? } else { ?>

Administrator</a>

<br>

LOGOUT</a></div><br>

<div class="teksdua">Camera<br>Position<br><br>

/*Script di atas digunakan untuk menggerakkan kamera dari website*/

</tr>

</table>

</div>

<? }?></td>

</tr>

</table></td>

<?

if (emptyString($_COOKIE[id])){

?>

</tr>

<td><a href="open.php">Open Streaming</td>

<td><a href="video.php">Video Capture </td>

<td><a href="viewpict.php">View Capture </td>

<td><a href="viewtrafik.php">View Traffic </td>

</tr>

</table><? } else {?>

</tr>

<td><a href="/open.php">Open Streaming</a></td>

<td><a href="/video.php">Video Capture</a> </td>

<td><a href="/viewpict.php">View Picture</a> </td>

<td><a href="/viewtrafik.php">View Traffic</a> </td>

</tr>

</table> <? }?> <br><br>

and here is my login.php script :

<?

include "header.php";

switch ($mod){

case "logout" : /*session_unregister($_SESSION[usrnm]);

$_SESSION[usrnm] = "";

unset($_SESSION[usrnm]);

session_unregister($_SESSION[id]);

$_SESSION[id] = "";

unset($_SESSION[id]);*/

setcookie("username","");

setcookie("id","");

message_url("Anda telah logout..Terima kasih atas kunjungannya!!!","/");

break;

default :

if (emptyString($_POST[usrnm])) message_back('Username belum diisi');

if (emptyString($_POST[psw])) message_back('Password belum diisi');

//cek di table (proses authentifikasi)

$pass_md5 = md5($_POST[psw]);

$qr = mysql_query("SELECT * FROM stream WHERE username='$_POST[usrnm]' AND password='$pass_md5'");

$loaduser = mysql_fetch_assoc($qr);

if (mysql_num_rows($qr) == '1'){

/*Create session

session_register("usrnm");

$_SESSION[usrnm]="$loaduser[username]";

session_register("id");

$_SESSION[id]="$loaduser[id]";*/

setcookie("username","$loaduser[username]");

setcookie("id","$loaduser[id]");

message_url("Selamat Datang $loaduser[nama]","/admin.php");

} else {

message_back('Username/Password Anda salah... data tidak ditemukan');

}

break;

}

include "footer.php";

?>

This is really killing the functionality of the site.Any help would be greatly appreciated.

JonnoTheDev · October 31, 2008

any header() command must be called before any output is displayed to the screen. this is why you see this error

kenrbnsn · October 31, 2008

Please do not double post. Topic locked.

Ken

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