PHP - Cannot Send Session Cookie - Eaders Already Sent

I am trying to create an index page which contains registration and login field
the problem that i get is on successful login a warning is displayed
session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at C:\xampp\htdocs\Eventz.com\index.php:116) in C:\xampp\htdocs\Eventz.com\index.php on line 235

This is the login part of my index.php
this tag is inside an html table below the login form
I also have a registration form and its php code above the login form


Code: [Select]
<?php
if (isset($_REQUEST['pass']))
{
    $id=$_POST['id'];
    $pass=$_POST['pass'];

    $conn =mysql_connect("localhost","root","");
    if (!$conn)
    {
   die('Could not connect: ' . mysql_error());
    }
/*
checking connection....success!
*/
    $e=mysql_select_db('test', $conn);
    if(!$e)
    {
   die(''.mysql_error());
    }
    else
    {
   echo 'database selected successfully';
    }

    if (isset($_REQUEST['id'])  || (isset($_REQUEST['pass'])))
    {
        if($_REQUEST['id'] == "" || $_REQUEST['pass']=="")
        {
       echo "login fields cannot be empty";
        }
        else
        {
            $sql=mysql_query("Select email,password from login where email='$id' AND password='$pass'");
            $count=mysql_num_rows($sql);
            if($count==1) 

    /* $count checks if username and password are in same row */
            {   
                session_start();
                $_SESSION['id']=$id;
                echo "</br>Login Successful</br>";
            }
            else
            {
           echo "</br>invalid</br>";
           echo "please try to login again</br>";

            }
        
        }   
    }
}
?>


Any help or suggestion would be appreciated

Hi, I am just recently getting this error message:Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/XXX/chordsandguitar.com/index.php:46) in /home/jchords/chordsandguitar.com/index.php on line 48

this is no doubt related to the fact that my site has been hacked along with 1000's of others that are on dreamhost. I don't know if it's related to php file permissions some of my files may have had had their permission set for read-write when they should not have been. They have all been changed to the more restrictive 755 or 644.

So here is how I am using the session_start to store some variables:

Code: [Select]

session_start();

if (!isset($_SESSION["count"]))
{
$_SESSION["count"]=0;
}
else
$_SESSION["count"]++;

if ($_SESSION["count"] == 0)
{
$scale_menu = 'C';
$variation_menu = 'maj';
$code_id = '1';
}
else
{
//allows retreiving the value of the drop-downs after the Select button has been pushed
// has to be skipped on the first access or overwrites starting vars. to null
if (isset($_GET['s_menu']))
$scale_menu = $_GET['s_menu'];
else
$scale_menu = $_GET['scale_menu'];
}


So any ideas why I am getting this error?

Thanks,

Jacques

I am confused why I am getting the following error and was wondering if I could get a 2nd pair of eyes..
error:
[29-Jul-2010 20:58:01] PHP Warning:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cookie - headers already sent in /home/curren11/public_html/mysite***.com/file_monitor.php on line 2
[29-Jul-2010 20:58:01] 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/curren11/public_html/mysite***.com/file_monitor.php:2) in /home/curren11/public_html/mysite***.com/file_monitor.php on line 2

Here is the code:
<?php
session_start();

$root_path = realpath(getcwd());
$error_monitor_file = $root_path.'/file_modify.txt';
$hour = date("H");
$today = date("m-d-Y");



     $myFile2 = "file_monitor.php.log";
     $fh3 = fopen($myFile2, 'a');
     $log_msg = "Last ran on: ".$today." at: ".$hour." \n";
     fwrite($fh3, $log_msg);
    

function scan_dir($path)
{
 $out = array();
 $files = opendir($path);

while ($f = readdir($files))
{
  $extension = substr($f,-3);
     
   if ($f=='.' or $f=='..' or $extension=='jpg' or $extension=='JPG' or $extension=='png' or $extension=='gif' or $f=='file_monitor.php' or $f=='file_modify.txt' or $f=='file_monitor.php.log' or $f =='error_log'  ) 
     {
   continue;
 }
 
  if (is_dir($path.'/'.$f))
    {
  $out = array_merge($out, scan_dir($path.'/'.$f));
} 
  //if  (((!is_dir($path.'/'.$f)) && ($f!='.' or $f!='..' or $extension!='jpg' or $extension!='JPG' or $extension!='png' or $extension!='gif'))
  else
  //  {
    $out[] = $path. '/'. $f;
//}
}

  $_SESSION['all_files'] = $out;
  
 return $out;
}

$a = scan_dir(getcwd());

$count_array = count($_SESSION['all_files']);
$loop_count=0;
while($loop_count < $count_array)
{
  // file in directory when was it last changed ?
  $filechange1 = date("m-d-Y-H", filemtime($_SESSION['all_files'][$loop_count]));
 
 // was it chnaged today and have I sent out an alert yet?
 if($filechange1 == $today."-".$hour) 
  {
$fh2 = fopen($error_monitor_file, 'a');
fwrite($fh2, "\n alert, file: ".$_SESSION['all_files'][$loop_count]." was changed today within the last hour ! \n");
    fclose($fh2);
  }
 $loop_count ++;
 // log file? was it changed this past hour?
 if (file_exists($error_monitor_file))
 {
   $filechange_log = date("m-d-Y-H", filemtime($error_monitor_file));
 
if ( ($loop_count == $count_array ) && ($filechange_log == $today."-".$hour ) )
{
        email();
     }
}
}

// function for email...
function email()
{
require_once ('class.phpmailer.php');

$mail = new PHPMailer();

$mail->IsSMTP();                                   // send via SMTP
$mail->Host     = "localhost"; // SMTP servers
$mail->SMTPAuth = true;     // turn on SMTP authentication
$mail->Username = "**c66@***ar.com";  // SMTP username
$mail->Password = "*****"; // SMTP password
$mail->From     = "***@***.com";
$mail->FromName = "Colonial Cottage File Changed";
$mail->AddAddress("email@*****.com"); 

$mail->WordWrap = 50;                              // set word wrap
//$mail->AddAttachment("/var/tmp/file.tar.gz");      // attachment
//$mail->AddAttachment("/tmp/image.jpg", "new.jpg"); 
$mail->IsHTML(true);                               // send as HTML

$mail->Subject  ="Unauthorized file changed today!";
$mail->Body     =  "" ;

$mail->AltBody  =  "This is the text-only body";

if(!$mail->Send())
   {
     exit();
   }
}

 if ((file_exists($error_monitor_file)) && $hour == "00")
 {
   unlink($error_monitor_file);
 }
 fclose($fh3);
 exit();
?>

in this page
 http://maximaart.com/newscp/
i have this problem
Code: [Select]
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/maximasy/public_html/newscp/index.php:1) in /home/maximasy/public_html/newscp/index.php on line 2

my source code is

<?php
session_start();
include_once("config.php"); 
include_once("functions.php");
$errorMessage = '';
if (isset($_POST['txtUserId']) && isset($_POST['txtPassword'])) {
if ($_POST['txtUserId'] === "$user" && $_POST['txtPassword'] === "$pass") {
// the user id and password match,
$_SESSION['basic_is_logged_in'] = true;
require("main.php");
exit;?>

I am having trouble resolving an error.

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/s519970/public_html/header.php:27) in /home/s519970/public_html/admin/login.php on line 2

 What I can gather is I can't use "header (Location: 'admin.php')" after i've used session_start(). I have tried to replace the header (Location: 'admin.php') with this:

                echo "<script>document.location.href='admin.php'</script>";
      echo "<script>'Content-type: application/octet-stream'</script>";

I've been trying to read up on solutions but haven't been able to get it sorted. If anyone can offer some advice that would be greatly appreciated as im new to php.

Code: [Select]
<?php
  session_start();
  if(isset($_SESSION['user']))

                echo "<script>document.location.href='admin.php'</script>";
echo "<script>'Content-type: application/octet-stream'</script>";
?>

<div id="loginform">

<form action="dologin.php" method="post">
<table>
<tr>
<td><span>Username:</span></td>
<td><input type="text" name="username" /></td>
</tr>
<tr>
<td><span>Password:</span></td>
<td><input type="password" name="password" /></td>
</tr>
<tr>
<td colspan="2" align="right"><input type="submit" name="login" value="Login" /></td>
</tr>
</table>
</form>

</div>
I have tried using require_once('yourpage.php'); before my <head></head> tags in the header document where I've specified the html information but this doesn't seem to work. I've been advised to use ob_start("ob_gzhandler"); but I am not sure how to implement this.

Any advice is greatly appreciated!