Warning: session_start() [function.session-start]:

Question

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Headers already sent by PHP

Iam trying to develop a web application it show a warning as

Warning: session_start() [function.session-start]: Cannot send session cache limiter - >headers already sent (output started at /home/wwwwdmar/public_html/index.php:1) in >/home/wwwwdmar/public_html/index.php on line 1

This is the top side codes of the index page.

<?php session_start();
require "config/database.class.php";
//  require 'fbook/src/facebook.php';
require "core/corefunction.php"; 

$selectrecentproducts = "SELECT listitemname,rollover,productkey,category_name,sub_category_name FROM ".$tbl_products."   INNER JOIN ".$tbl_main_categories." INNER JOIN ".$tbl_sub_categories." ON ".$tbl_products.".categoryname=".$tbl_main_categories.".category_id AND ".$tbl_products.".sub_category_id=".$tbl_sub_categories.".sub_category_id  WHERE status= 0 ORDER BY product_id DESC LIMIT 8";
//echo $selectrecentproducts;exit;

Please take a look in it

No output started at /some/file.php:12) in /some/file.php on line 23. Please check the outputstarted at 12th line and on in 23rd line. IN my case both of these 2 are in the first line. Thats y confusing — user1431849, Jul 15 '12 at 12:04
No I have chyecked it before there is no single space or character before and after the php opening and closing tags — user1431849, Jul 15 '12 at 12:20
some editors leave hidden characters, especially those utf8 with a bom. check the file in hexedit to be sure. — Dreaded semicolon, Jul 15 '12 at 12:23

score 0 · Accepted Answer · answered Jul 15 '12 at 12:09

0

The problem is PHP is sending some data before starting session_start() which is illegal. You should fix the problem [I dont know what the problem is as you have not shared all of your code] or you could try error reporting to 0 before session_start()

answered Jul 15 '12 at 12:09

Sourav

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Ya we can hide the error reporting by using it. But I want to clear the stuff. – user1431849 Jul 15 '12 at 12:10

score 0 · Answer 2 · answered Jul 15 '12 at 12:12

0

session_start() must be called before ANY output is sent to the browser. This includes whitespace. Make sure you are NOT sendin ANYTHING before that call. The same applies to header and setcookie.

You can "cheat" by calling ob_start() as the first thing, then you don't have to worry about it. However, bear in mind that this adds overhead, so you should only really use this solution if you actually make use of ob_start()'s features.

answered Jul 15 '12 at 12:12

Niet the Dark Absol

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How to use ob_start() to solve this issue.? Main problem is that due to this warning header location is not working :( – user1431849 Jul 15 '12 at 12:18
Like I said, call it as the VERY FIRST thing. – Niet the Dark Absol Jul 15 '12 at 12:22

Warning: session_start() [function.session-start]:

2 Answers2