PHP Newbie

pexeter · 06-27-2004, 01:54 AM

Hi, Im just getting started with php and I ran into some problems with an example from a book. The code Im using is:

<!doctype html public "-//W3C//DTD HTML 4.0 //EN">
<html>
<head>
<title>Chapter 1 Example. Figure 1.2</title>
</head>
<body>
<?php
if(!session_is_registered('nCount'))
{
session_register('nCount');
$nCount = 1;
}
else
{
$nCount++;
}
?>

<p>Hello, you have seen this page <?php echo $nCount; ?> times.</p>

<p>To continue, <a href="somepage.php?<?php echo strip_tags(SID)?>">click here (sompage.php?<?php echo strip_tags(SID)?>)</A></p>

</body>
</html>

When I run it I get the following error:

Warning: session_register(): Cannot send session cookie - headers already sent by (output started at C:\apache\public_html\example01_01.php:7) in C:\apache\public_html\example01_01.php on line 10

Warning: session_register(): Cannot send session cache limiter - headers already sent (output started at C:\apache\public_html\example01_01.php:7) in C:\apache\public_html\example01_01.php on line 10

Can anyone please help?

sde · 06-27-2004, 06:23 AM

session information is header information. it needs to execute before anything is printed to the browser.

move your script above the html, with NO whitespace above the opening php tag.

also, i think you might need a session_start(); at the very top of the page.

bdl · 06-27-2004, 11:36 AM

Aside from what sde mentioned (and it doesn't appear that you have session_start() at all in your script, else the error message would have mentioned it), both session_register() and session_is_registered() are deprecated and you should instead use the superglobal $_SESSION. I would guess that the book you're using is outdated.

Please read the PHP Manual sections on Session handling functions, specifically the pages for session_register() and session_start().

pexeter · 06-27-2004, 01:23 PM

Thanks to both of you for your help. I finaly got it to work. I just find it weird that code taken from the cd that accompanied the book would be wrong. Thanks again.

bdl · 06-27-2004, 05:04 PM

Quote:

Originally posted by pexeter
Thanks to both of you for your help. I finaly got it to work. I just find it weird that code taken from the cd that accompanied the book would be wrong. Thanks again.

Very good. I wouldn't necessarily say that the book or the code that accompanied the book is 'wrong', it's just a little outdated. I've responded to many questions along these same lines due to two main factors: the usage of global variables and the usage of superglobals, which are related for the most part and which have become a big factor since PHP v4.2. So some changes were made, and instantly every PHP book on the market is outdated. Most books now have been re-released with the new information, however.