Chuck Anderson wrote:
Ben wrote:
Edward Martin said the following on 11/17/2005 04:27 PM:
"Warning: Cannot modify header information - headers already sent by
(output started at
/usr/home/ecmartin/public_html/ethics06/calendarlogin.php:8) in
/usr/home/ecmartin/public_html/ethics06/sas.php on line 34"
It means you are trying to change the page's headers after they have
already been sent to the user's browser. You are probably trying to
use the header() function after HTML/Javascript/what have you has
already been sent to the browser. If you need to use header() you
should write any earlier output to a variable and only output it to
the browser after any header() function use.
- Ben
Most likely that is exactly what's happening. To be even more clear -
the solution is to use the header function before any HTML (before *any*
output). I learned this when I had an include file that was all Php
causing this problem. The end of the included file had a carriage return
after the closing tag ?>. That was a nasty one to locate. Now I always
make sure there is no white space after the closing tag in files I might
include somewhere else.
An alternative solution is to just turn on output buffering, which will
make sure no output gets sent until after all PHP has stopped processing
(unless you specifically tell it to get sent earlier).
Jasper
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