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Re: simple session question [message #175700 is a reply to message #175696] Fri, 21 October 2011 21:43 Go to previous messageGo to previous message
cerr is currently offline  cerr
Messages: 33
Registered: September 2010
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On Oct 21, 11:19 am, Thomas Mlynarczyk <tho...@mlynarczyk-
webdesign.de> wrote:
> cerr schrieb:
>
>> if(!isset($_SESSION['stp'])) {
>>   session_start();
>>   $_SESSION['stp'] = 0;
>>   echo "session started<br>\n";
>> }
>
> You need to call session_start() on *every* page request, not just when
> you initialize the session (think of it as
> "session_start_or_continue()"). The $_SESSION superglobal does not exist
> until you have called session_start(), so your code above won't work.
>
>> switch($_SESSION['stp']) {
>>   case 0: $_SESSION['stp'] = $_SESSION['stp']++;
>>              echo "stp:".$_SESSION['stp'];
>>              break;
>>   case 1: $_SESSION['stp'] = $_SESSION['stp']++;
>>              echo "stp:".$_SESSION['stp'];
>>              break;
>>   case 2: $_SESSION['stp'] = $_SESSION['stp']++;
>>              echo "stp:".$_SESSION['stp'];
>>           $_SESSION['stp'] = 0;
>>              break;
>
> You're missing a } here. But even with that and the session_start()
> issue fixed, it always prints 0. I'm not quite sure why, but anyway your
> code is unnecessarily complicated. Here's my version:
>
> session_start();
> if ( !isset( $_SESSION['stp'] ) )
> {
>      $_SESSION['stp'] = 0;
>      echo "session started<br>\n";
>
> }
>
> echo $_SESSION['stp'];
> $_SESSION['stp'] = ( $_SESSION['stp'] + 1 ) % 3;
>
> I use the modulo operator % to achieve the cycling through the values 0,
> 1, 2.
>

Weird, my phpinfo() says: "Session Support enabled"
but even with code like this
<?php
session_start();
echo ++$_SESSION['test'];
?>
just prints "session_start(); 1" - and i'm wondering why it's printing
session_start(); in the browser, seems like it doesn't know this
command...? Weird, any clues...?

Thanks alot!
Ron
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