difference between code? session problem

[chings]

Warning: session_start() [function.session-start]: Cannot send session cache
limiter - headers already sent (output started at
d:\web\htdocs\sqltest\formsession\login_start.php:2) in
d:\web\htdocs\sqltest\formsession\login_start.php on line 4
for the following code

<?php

session_start();

if (!isset($_SESSION['name']))

{
$_SESSION['name'] = "";

}

if (!empty($_SESSION['name']))

{

echo ($_SESSION['name'] . " success login");

}

else { include('loginwindow.html'); }

?>

but it 's prefect for me to run the counter as follow .. it seems they are
the same

<?php
session_start();

if (!isset($SESSION['count'])) {
$SESSION['count'] = 0;

} else {
$_SESSION['count']++;
}

echo($_SESSION['count']);
?>

[Mark]

i belive you have to register the session first.

..oh wait sorry, didnt read the header part. make sure that code is the first thing on your page. that will get rid of that error

[chings]

when i put the <?php at line1 , then no more error , but it at line2 , then it's not o.k ....

[Natty_Dreadlock]

that's because php wants to set a session cookie, and if u put <?php in line 2, line 1 (which contains only \n) will be sent to the browser...and the cookie header cannot be sent anymore. so make sure your session code is the first on the page, without any data or even whitespaces before..