php session error

[mishrarajesh44]

hii..
i am getting error msg when running this program. pls verify if anybody can..

code:

<?php    
    session_start();
    //session_register("username");
    //session_encode();
    //$url="Location:loggedin.php?PHPSESSID=".$PHPSESSID;
    // header($url);
     if(isset($_POST['submit']))
     {   if(empty($password)){echo "No password specified";}
        $connection=mysql_connect("localhost","wwwuser_raja","kalika");
      if(!$connection)
        {echo"<b>connection not set...</b><br>";}
            $sel=mysql_select_db("wwwuser_raja");
      if(!$sel)
        {echo"<b>database not selected...</b><br>";}
     $query="select password from users where username='".$username."'";
     $result=mysql_query($query);
     if($row=mysql_fetch_array($result))
     {
         if(!(md5($password)==$row["password"]))
           {echo "Wrong Password !";} 
     }
     else
     {echo "<b>User does not exists  !!</b>";}    
     //session_start();
     session_register("username");
     session_encode();
     $url="Location:loggedin.php?PHPSESSID=".$PHPSESSID;
     header($url); 
  }    
?>

error:

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 2 Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 28

pls veryfy soon ..waiting for rply..

[ShawnCplus]

You have already output something to the page before you start the session which must come before any headers are sent ie. data sent to the page. I'm not sure where in your file you have that

[mishrarajesh44]

You have already output something to the page before you start the session which must come before any headers are sent ie. data sent to the page. I'm not sure where in your file you have that

i know the concept yhay you are telling"session should be started 1st"

but wher is the problem
pls try if you can find the problem..
my code:-

<?php
session_start();
//session_register("username");
//session_encode();
//$url="Location:loggedin.php?PHPSESSID=".$PHPSESSID;
// header($url);
if(isset($_POST['submit']))
{ if(empty($password)){echo "No password specified";}
$connection=mysql_connect("localhost","wwwuser_raja","kalika");
if(!$connection)
{echo"<b>connection not set...</b><br>";}
$sel=mysql_select_db("wwwuser_raja");
if(!$sel)
{echo"<b>database not selected...</b><br>";}
$query="select password from users where username='".$username."'";
$result=mysql_query($query);
if($row=mysql_fetch_array($result))
{
if(!(md5($password)==$row["password"]))
{echo "Wrong Password !";}
}
else
{echo "<b>User does not exists !!</b>";}
//session_start();
session_register("username");
session_encode();
$url="Location:loggedin.php?PHPSESSID=".$PHPSESSID;
header($url);
}
?>

error:-
Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 2 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 2 Warning: Cannot modify header information - headers already sent by (output started at /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php:1) in /hsphere/local/home/wwwuser/home.mishra.biz/addressbook/login.php on line 28

[ryan_vietnow]

You cannot use header when you have echoed something above it.Try not to use echo when using header().