do not understand Cannot send session cookie - headers already sent

Question posted by: craigtomo (Newbie) on February 25th, 2008 06:00 PM

i have changed my login .php file to the following

this file is opened directly and is not called from any other file

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	<?php
 
// dBase file

$host=""; // Host name

$username=""; // Mysql username

$password=""; // Mysql password

$db_name=""; // Database name

$tbl_name=""; // Table name 

// Connect to server and select databse.

mysql_connect("$host", "$username", "$password")or die("cannot connect");

mysql_select_db("$db_name")or die("cannot select DB");

session_start();
 
if ($_GET["op"] == "login")

 {

 if (!$_POST["username"] || !$_POST["password"])

  {

  die("You need to provide a username and password.");

  }
 
 // Create query

 $q = "SELECT * FROM `dbUsers` "

  ."WHERE `username`='".$_POST["username"]."' "

  ."AND `password`=PASSWORD('".$_POST["password"]."') "

  ."LIMIT 1";

 // Run query

 $r = mysql_query($q);
 
 if ( $obj = @mysql_fetch_object($r) )

  {

  // Login good, create session variables

  $_SESSION["valid_id"] = $obj->id;

  $_SESSION["valid_user"] = $_POST["username"];

  $_SESSION["valid_time"] = time();
 
  // Redirect to member page

  Header("Location: members.php");

  }

 else

  {

  // Login not successful

  die("Sorry, could not log you in. Wrong login information.");

  }

 }

else

 {

//If all went right the Web form appears and users can log in

 echo "<form action=\"?op=login\" method=\"POST\">";

 echo "Username: <input name=\"username\" size=\"15\"><br />";

 echo "Password: <input type=\"password\" name=\"password\" size=\"8\"><br />";

 echo "<input type=\"submit\" value=\"Login\">";

 echo "</form>";

 }

?>

this is the screen i am getting when i acces the page

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at D:\virtualservers\182763\root\test\login\lo\login. php:1) in D:\virtualservers\182763\root\test\login\lo\login. php on line 12

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:\virtualservers\182763\root\test\login\lo\login. php:1) in D:\virtualservers\182763\root\test\login\lo\login. php on line 12

i would like some help please in locateing the sourtce of the errors

i know the errors are from the <?php in line one but therfe are NO spaces after this line only a return

i get the error when i enter a correct or a false user name

i know the database info i put in is correct as i can add data to the table fine

thanks

craigtomo

Newbie

8 Posts

February 25th, 2008
06:03 PM
#2

Re: do not understand Cannot send session cookie - headers already sent

i was also wondering if it could be a setup fault on my server as i have been reciveing the same sort of errors useing differant code

all i am trying to do is create a database login

Markus

Moderator

2,217 Posts

February 25th, 2008
06:13 PM
#3

Re: do not understand Cannot send session cookie - headers already sent

session_start() needs to be at the very top of your page! ALL THE TIME!

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<?php

session_start();
 
// rest of code

craigtomo

Newbie

8 Posts

February 25th, 2008
09:07 PM
#4

Re: do not understand Cannot send session cookie - headers already sent

i have put the session start in as you suggested and this is now the error i am reciveng

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at D:\virtualservers\182763\root\test\login\lo\login. php:1) in D:\virtualservers\182763\root\test\login\lo\login. php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:\virtualservers\182763\root\test\login\lo\login. php:1) in D:\virtualservers\182763\root\test\login\lo\login. php on line 2

ronverdonk

Moderator

4,139 Posts

February 25th, 2008
10:17 PM
#5

Re: do not understand Cannot send session cookie - headers already sent

Are you sure that there is no blank following the <?php. If so take it out.

Ronald

craigtomo

Newbie

8 Posts

February 27th, 2008
10:34 PM
#6

Re: do not understand Cannot send session cookie - headers already sent

there is deffinetly no blanks after or before the <?php command

could it be somethingto do with the setup on my server as i have been getting similar problems with lots of different types of script i have been trying?

all i want is a simple login process

ronverdonk

Moderator

4,139 Posts

February 27th, 2008
10:43 PM
#7

Re: do not understand Cannot send session cookie - headers already sent

Something must have been outputted before the session_start() was executed. You sure that was all the code?

Ronald

craigtomo

Newbie

8 Posts

February 28th, 2008
04:28 PM
#8

Re: do not understand Cannot send session cookie - headers already sent

Quote:

Something must have been outputted before the session_start() was executed. You sure that was all the code?

Ronald

there is no other code

that is why i think it might be on my server that is the problem

the file is located at http://equifor.soon2b.net/test/login/lo/login.php

please can you try and run it and see if you are getting the same errors i am

it is really frustrateing me

thanks

hsriat

Expert

1,471 Posts

February 29th, 2008
05:27 AM
#9

Re: do not understand Cannot send session cookie - headers already sent

Quote:

No line break too?

This error is only shown if you have sent something before the header is set.

craigtomo

Newbie

8 Posts

February 29th, 2008
07:05 PM
#10

Re: do not understand Cannot send session cookie - headers already sent

there is nothing else in the file apart from what is shown

as i have said i have had similar problems with various files all with the same responce

cyberforester

Newbie

1 Posts

March 29th, 2008
01:28 AM
#11

Re: do not understand Cannot send session cookie - headers already sent

Same thing is happening to me and it has me tearing my hair out.

I have downloaded and customised a script that allows users to enter a password in order to move to a part of the site I want protected from the general public.

I debugged the script and had it working on my development machine (fedora 7, apache and php 5.x). I thought i was doing great, and then I uploaded it to the production machine which is Windows 2k3, IIS 6 and Php 5.x. That's when the wheels came off and i start getting this error.

What is going on? I always seem to add extra to my development time by having to work around the Windows insanity.

hsriat

Expert

1,471 Posts

March 29th, 2008
06:09 AM
#12

Re: do not understand Cannot send session cookie - headers already sent

Quote:

If you are using Notepad, then open the file in another editor and remove the stuff before sending header.

Regards

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