php header ( need help)

[csun]

helo

need help pls i wonder that there is an error on this code ...

<?php
ob_start();
header("location:login.php");
?>

error :

Warning: Cannot modify header information - headers already sent by (output started at F:\Server\htdocs\fixed-1c\index.php:1) in F:\Server\htdocs\fixed-1c\index.php on line 3

[Ryan Fait]

You can only redirect when nothing has been written to the page. Ie, this will not work:

Code: Select all

<?php
echo "Hello world";
header("Location: login.php");
?>

But this will.

Code: Select all

<?php
header("Location: login.php");
?>

[dannyboy26]

Why are you starting output buffering when you want to presumably perform an instant header redirect? In other words, do you really want the ob_start(); there...

I would always recommend shoving
exit;

...directly after a call to header() to ensure that nothing else comes after that might send output to the browser and therefore cause the headers to be sent out and stop your header() call from working.