Session not working on My Web server - php

Question

Showing Error
Warning: session_start() [function.session-start]: Cannot send session cookie -
headers already sent by (output started at
/home/content/82/11942882/html/praveen/Allyface/index.php:8) in
/home/content/82/11942882/html/praveen/Allyface/index.php on line 11
Warning: session_start() [function.session-start]: Cannot send session cache limiter - >headers already sent (output started at >/home/content/82/11942882/html/praveen/Allyface/index.php:8) in >/home/content/82/11942882/html/praveen/Allyface/index.php on line 11
index.php
<?php
//simple PHP login script using Session
//start the session * this is important
session_start();
//login script
if(isset($_REQUEST['ch']) && $_REQUEST['ch'] == 'login'){
//give your login credentials here
if($_REQUEST['uname'] != '' && $_REQUEST['pass'] != '')
{
$email=$_REQUEST['uname'];
$pass=$_REQUEST['pass'];
//echo $email.$pass;
include("db.php");
mysql_query("select * from users where email='$email' and pass='$pass' ");
if(mysql_affected_rows()>0)
{
$_SESSION['login_user'] = $email;
}
else
{
$_SESSION['login_msg'] = 1;
}
}
else
$_SESSION['login_msg'] = 1;
}
//get the page name where to redirect
if(isset($_REQUEST['pagename']))
$pagename = $_REQUEST['pagename'];
//logout script
if(isset($_REQUEST['ch']) && $_REQUEST['ch'] == 'logout'){
unset($_SESSION['login_user']);
header('Location:index.php');
}
if(isset($_SESSION['login_user'])){
if(isset($_REQUEST['pagename']))
{
?>
//header('Location:'.$pagename.'.php');
<script type="text/javascript">
self.location='<?php echo $pagename.'.php'; ?>';
</script>
<?php
}
else
{
$email=$_REQUEST['uname'];
?>
<script type="text/javascript">
self.location='<?php echo 'home.php'; ?>';
</script>
<?php
}
//header('Location:home.php');
}else{
?>
<form id="" name="form1" method="post" action="">
<table width="452" border="0">
<tr>
<td width="172"> <input name="uname" type="text" style="margin-top:15px; width:150px; height:22px; border:1px solid #CCCCCC; padding-left:30px;" placeholder="Email or Phone" />
</td>
<td width="177"> <input name="pass" type="password" style=" margin-top:15px; width:150px; height:22px; border:1px solid #CCCCCC; padding-left:30px;" placeholder="Password" />
</td>
<td width="81"><input name="login" type="submit" style=" margin-top:15px; background-color:#FFFF00;background-color: #fdd922; margin-left:30px;
border: 1px solid #e0bc27; font-weight:bold;
border-radius: 2px 2px 2px 2px; height:25px; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; color: #565656;" placeholder="login" value="Login" /></td>
</tr>
<tr>
<td colspan="3"><?php
//display the error msg if the login credentials are wrong!
if(isset($_SESSION['login_msg'])){
echo '<div style="font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px; color:#F00;">Wrong username and password !</div>';
unset($_SESSION['login_msg']);
}
?> </td>
</tr>
</table>
<input type="hidden" name="ch" value="login">
</form>
</div>
<?php }
?>
home.php
<?php
session_start();
//check logged in or not!
if(!isset($_SESSION['login_user'])){
?>
//header('Location:index.php?pagename='.basename($_SERVER['PHP_SELF'], ".php"));
<script type="text/javascript">
self.location='<?php echo 'index.php?pagename='.basename($_SERVER['PHP_SELF'],".php"); ? >';
</script>
<?php
}
else
{
include("db.php");
$uname=$_SESSION['login_user'];
$q=mysql_query("select * from users where email = '$uname'");
while($r=mysql_fetch_array($q))
{
$uid=$r['fname'];
?>
Please Help me
Thanks in advance

Answer 1

Make sure there is no data sent by the server before dealing with Sessions.
This includes White Spaces, Blank Lines or any type of data.

Answer 2

The point where output started is shown in the error message:
output started at /home/content/82/11942882/html/praveen/Allyface/index.php:8
It seems you have a "dispatcher" index.php, which loads other php files (like login.php). The reason for this error is something being printed in index.php on line 8.
If you see nothing printed on index.php, then there might be a newline at the end of file (if you are using Vi, it leaves a trailing new line on every file)

Answer 3

It's not possible to set cookies (or send any other headers) after output is started. You could add
ob_start()
at line 1 to buffer the output.