Some Php's tigger info output to client before you set header.try this
code first
---------------------------------------------------------------
ob_start();//first line write this code
<<<some code for your self>>>
header("location:index.php");
ob_end_flush();
---------------------------------------------------------------
second.
You must check php.ini found that if flush implicit option turn on.
implicit_flush = On
=>
implicit_flush = Off

test your codes again.

If codes run correctly,check your codes line by lines ,found that such
as 'echo','print'... and so on before 'you
header("location:index.php")' line.
2009/8/28 Keith <survivor_...@hotmail.com>:
> I have a user sign up page that collects sign up information from user with
> form.
> This form will then be submitted to another process.php page for setting up
> the user account and send email to the user.
> After the email been sent out, the user will be directed back to homepage
> with header("location: index.php").
> However, error happen with warning: [Cannot modify header information -
> headers already sent by...]
> Any workaround for this?
>
> Thanks for help!
> Keith
>
>
>
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