redirection+session+phplib

Anon

To anyone could help,

Ok, i use phplib to do session management, and i do it with auto_prepend file on. So this happen when i use header function to do redirection,

Warning: Cannot add header information - headers already sent by (output started at /usr/local/apache/php/session.inc:195) in /usr/local/apache/htdocs/pages/can_info_process.php3 on line 24

So this probably means we can't send header for twice. Is there anyway to do it or fix it? No i dun want to use form action because i wish it to go silently.

And pls give me tips on how to ask browser to go "back" and "reload".

Thank you to whoever see this message and
bless you if you help.

eduard

First, you need to send the header information BEFORE you output anything.
This example doesn't work because I'm sending output () before I send the header

<?php
session_register("Username");
?>

but ----> the next example will work!!
<?php
session_register("Username");
?>

so if you have a function which manages your session... it'll look like this:
<?php
include 'path_to/include.file';
manageSessions();
?>
Output here...

reloading and back?? use Javascript..

history.go(0)
history.go(-1)

Anon

Thank you Eduard, that is one name I couldn't pronounce rightly. Base on your advise i check back to phplib code and found that the problems actually ly here,

$redirect=$sess->purl("can_info.php3");
header("location:$redirect");

now p stand for print, that means output, so instead of purl i should use url

$redirect=$sess->url("can_info.php3");
header("location:$redirect");

well this work and just for the record i wrote it down here.

And is there any good and pratical resources where i could quickly learn javascript? Just enough to do this
history.go(0)
history.go(-1) trick.

eduard

Javascript is just like PHP, since you can write your code imidiately into the source. The only (huge) diffrence you NEED to remember, javascript is clientside, and PHP is server side. So, your programming needs to be 'Compiled' and then started. When using JavaScript, it 'Compiles' and executes the code locally on your machine. PHP works exactly the smae, but on the server. The programming code (ofcourse) is very diffrent.
if you want you use your history the following example will work.

function goBack(){
history.go(-1);
}

function refreshPage(){
history.go(-1);
}

</SCRIPT>

<a href="javascript:goBack()">Visit last page</a>
<a href="javascript:refreshPage()">Reload this page</a>