[PHP] Problem z session_start (headers already sent) Opcje

[Vion]

Witam
Mam o to taki błąd
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /homepages/16/d339296823/htdocs/epicshot/addshot.php:1) in /homepages/16/d339296823/htdocs/epicshot/auth_user.php on line 3

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /homepages/16/d339296823/htdocs/epicshot/addshot.php:1) in /homepages/16/d339296823/htdocs/epicshot/auth_user.php on line 3
Nie moge przekierowac. Wyslano juz naglowki.
Probowałem już rożnych metod ale dalej nie działa, dałem tez ob_start() bo myślałem ze pomoże, ale nic z tego. Co jest nie tak?

o to kod auth_user.php

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<?php
ob_start();
session_start();
 
 
require_once "header.php";
 
 
if 
	((isset($_SESSION['user_logged']) &&
	$_SESSION['user_logged'] != "") ||
 
	(isset($_SESSION['user_id']) &&
	$_SESSION['user_id'] != "") ||
 
	(isset($_SESSION['user_password']) &&
	$_SESSION['user_password'] != "")) {
 
	} else {
	redirect('index.php');
	}
ob_end_flush();
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kod addshot.php

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<?php 
ob_start();
require_once "auth_user.php";
require_once "function_engine.php";
require_once "function_graph.php";
header_blok();
 
 
 filled();?>
 
<table border="0" width="631"  cellspacing="1" cellpadding="3" bgcolor="#353535" >
<tr>
<td border="0" bgcolor="#FF6633" width="100%" height="50" align="center">
	W tym miejscu możesz wrzucić swojego shot'a. <br>Przyjmowane są obrazy w formatach: GIF, JPG/JPEG i PNG.<br>
	Maksymalny rozmiar pliku to 1MB, 
	szerokosc :800 pikseli,
	wysokosc: 600 pikseli
	</b></center>
</td>
</tr>
</table><br>
 
<form name="image_add" method="post" action="transact_shot.php?action=add" enctype="multipart/form-data">
 
	<table border="0" width="631"  cellspacing="1" cellpadding="3" bgcolor="#259CF7" ><tr>
<td border="0" bgcolor="" width="100%" align="LEFT">&nbsp;&nbsp;UMIESZCZANY OBRAZ</td></tr></table><br>
	<input name="image_filename" type="file"  size="29"> <br><br>
	<table border="0" width="631"  cellspacing="1" cellpadding="3" bgcolor="#259CF7" ><tr>
 
 
	</select> 
 
 
<input type="submit" name="Submit" value="Wyślij">
 
</form><BR><BR>
 
<?php 
ob_end_flush();
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header.php

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<?php
 
function redirect($url) {
	if (!headers_sent()) {
	header('Location: http://' . $_SERVER['HTTP_HOST'] .
			dirname($_SERVER['PHP_SELF']) . '/' . $url);
	} else {
		die('Nie moge przekierowac. Wyslano juz naglowki.');
		}
	}
 
ob_end_flush();
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