Ambiguous error message

[vcherubini]

Hello:

I am working with session management and I keep getting the same error:

Warning: Cannot send session cache limiter - headers already sent (output started at lib.inc.php:233) in c:\apache\htdocs\mobius\login.php on line 6.

login.php looks like this:

[tt]
<?php
include(&quot;lib.inc.php&quot;
connect();
login(&quot;SELECT * FROM users WHERE username='$username' AND password='$password'&quot;
back();
session_start();
session_register(&quot;username&quot;

?>
[/tt]

What I want to happen is when a user types his/her password in on index.php, it will authenticate them (that part works fine) and then register the variables $username and $password so that I can use them throughout the remainder of the user session on my site.

Any help on how I can get this to work would be greatly appreciated.

Thanks.

-Vic
vic cherubini
vikter@epicsoftware.com

http://www.epicsoftware.com

====
Knows: Perl, HTML, JavScript, C/C++, PHP, Flash, Director
====

 

[vcherubini]

I found the err of my way.

The session functions must be before anything is printed to the browser.

I just put them at the top of the script and it works fine.

Thanks.

-Vic vic cherubini
vikter@epicsoftware.com

http://www.epicsoftware.com

====
Knows: Perl, HTML, JavScript, C/C++, PHP, Flash, Director
====

 

[rycamor]

Yes, normally headers (which are used by sessions) cannot be sent if any other output has already started sending to the browser, because well... a header means it comes *before* output, and PHP/Apache automatically stick a header on everything, the minute any output begins. There is a way around this, though, and it's worth checking out, because it can provide some major clues for writing more complex web-based apps. It's called Output Buffering. See

http://zend.com/zend/art/buffering.php

It is what it sounds like. It buffers the output until the script is finished, checking for any header calls, and handling them first, among other things.

 

[vcherubini]

rycamor:

Thanks a lot for that! I will definitely check that site out.

-Vic vic cherubini
vikter@epicsoftware.com

http://www.epicsoftware.com

====
Knows: Perl, HTML, JavScript, C/C++, PHP, Flash, Director
====