session_start(); gifs a warning

hmgroen

When I want to open a session_start(); in my PHP page I've got a warning in return.

Why?

Here's a detail of my script:

$requete = "select * from tableutil where pseudo='$pseudo_ident'";
$resultat = mySql_query($requete);
$row= mysql_fetch_array($resultat);
$motpas_base=$row["motpass"];

//echo $motpas_base;
//echo " ";

if ($motpas_ident==$motpas_base)
{

// recuperation du profil de l'utilisateur

$util=$row["profil"];

// ouverture d'une session pour l'utilisateur

session_start();
$utilisateur=$util;
session_register("utilisateur");

echo "$pseudo_ident";
echo " ";
echo "$motpas_ident";
echo " ";
echo "$util";
echo " ";
echo "$utilisateur";
echo " ";

kevinsequeira

what is the warning you get, maybe u have blank spaces on top of the page.

reg
kevin

hmgroen

the warning I get is:

Warning: Cannot send session cache limiter - headers already sent (output started at c:\easyphp\www\utilisateur_identification_base.php:11) in c:\easyphp\www\utilisateur_identification_base.php on line 104

line 11 is the beginning of my PHP page and line 104 is were I've put my session_start();

kevinsequeira

that means that at line 11 , the php page has printed out a response, meaning there is a blank space or some character printed out.
the page cannot generate any output onto the screen before u use sessions
just check ure code again there will be a blank space on line 11 in your code.
reg
kevin

[ PS : u could use buffering but in this case its probably a blank character]

hmgroen

I've found something and it is probebly working.

The session_start must be all on the top of the page before any other commands or other blancs (like you've said before).

But now for using the session. How can I ask it, if I need it?
The same in the beginning of my page?

kevinsequeira

im sorry, i didnt understand what your trying to say ??

but if you want to use session_start() and session_register() then you can use it anywhere in your page as long as the page does not output anything to the screen, this can be any html tags or blank spaces, before you call session_start().

here is a tutorial that might help you

http://www.phpfreaks.com/tutorials/41/0.php

reg
kevin