RE: [PHP] Validation and session variables

> --- Chris Shiflett <shiflett@php.net> wrote: > > > On each page, it might be good to add some debugging > > information near the > > top (where session_start() is): > > > > <?php > > session_start(); > > echo '<pre>' . htmlentities(print_r($_COOKIE, true)) > > . '</pre>'; > > echo '<pre>' . htmlentities(print_r($_GET, true)) . > > '</pre>'; > > echo session_id(); > > ... > > > I added this in , on top, right under session_start() > as shown and get this error: > > Warning: Cannot modify header information - headers > already sent by (output started at > /home/lurkkcom/public_html/page1.php:6) in > /home/lurkkcom/public_html/page1.php on line 54 > > So it's clashing with the redirect: > > Header ('Location: > http://www.mysite.com/page2.php?'.SID); > If your script outputs anything and then tries to redirect it WILL throw that error. I believe if you want to do echos AND redirects you'll have to use output buffering (see the manual: http://uk.php.net/outcontrol) and only output the buffer if you do not redirect. HTH Graham