Php and sessions, header already sent

Question

Possible Duplicate:
Headers already sent by PHP

I know that I must use session_start() at the very top of the page, so the HTTP header can do his job before the HTTP body was started to send to the client. But it doesn't work well for me.

Here, I want to reset the session...

<?php 
ini_set( "display_errors", 0);  // Even without this it doesn't work, it's temporary to hide the problem
session_start();
$_SESSION = array();  // Clear the session
$_SESSION['state'] = "noConnection";
?>

<!DOCTYPE html>
<html> 
    <head>    // blah blah

Also beware of anything after a closing `?>` tag in any includes. If you have a page that is nothing but PHP, I recommend leaving out the `?>` tag just to avoid this problem. — Brad, Jun 16 '12 at 15:00
is this the complete script? Only possible error that I can think of if it is - you have some whitespace before the opening tag. If the file is in utf8 - check that it doesnt have a BOM (c/p the text to a new document and save in ansii) — karka91, Jun 16 '12 at 15:01

score 2 · Accepted Answer · answered Jun 16 '12 at 15:04

2

The correct answer is to ensure there is nothing, not even spaces, or the UTF8 BOM character, before the first opening <?php tag.

The cheating answer is to set php.ini's output_buffering directive to On.

answered Jun 16 '12 at 15:04

Niet the Dark Absol

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My files were encoded with UTF8 format, I converted them in UTF8 w/o BOM. Thanks a lot ! – Pascal Boutin Jun 16 '12 at 15:08
Glad I could help. Sadly, few people seem to remember about the massive impact that the BOM can have, and always assume it's your fault with spaces somehow. – Niet the Dark Absol Jun 16 '12 at 15:10
true, all I found on some forums were all about white spaces... haha – Pascal Boutin Jun 16 '12 at 15:12

score 0 · Answer 2 · edited Jul 14 '12 at 08:43

0

Make sure there are no spaces before you open the <?php tag.

edited Jul 14 '12 at 08:43

apaderno

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answered Jun 16 '12 at 15:01

ShayneStatzell

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Php and sessions, header already sent

2 Answers2