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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.php
Subject: Re: Problem validating user and hashed value in db
Date: Fri, 13 Jan 2017 20:02:56 +0100
Organization: solani.org
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On 13.01.2017 at 19:30, wart2ww wrote:

> On Friday, January 13, 2017 at 9:58:27 AM UTC-8, Jerry Stuckle wrote:
>
>> The fact you're getting the message indicates you are outputting
>> something before the header call.  You should also have a message
>> indicating what line on which file is generating the output.
> 
> I will keep trying. FYI, I did put the php block at the top of the page above any html (before the doctype declaration, made sure there were not spaces before the php block and even put the entire header code on one line with no spaces then with some spaces in the statement. Still no success so that what confuses me. I won't bug you any more but I really do appreciate your help.

As Jerry had written, the message you get is something like

  "Cannot send headers; headers already sent in <filename>, line
   <lineno> in <filename>:<lineno>"

The last <filename> and <lineno> indicate the place of the header()
call, the first <filename> and <lineno> indicate where the output started.

-- 
Christoph M. Becker