SMF and session

[MarcoK]

Hi at all.

I'm doing to write a script for including wfCart() a shopping cart session based into SMF.

I have a trouble saving data into session.

I use this class as example

Code Select Expand


class Cart {
var $nuovo = 0;
var $vecchio = 0;
function cart(){} //costruttore di classe;

function add($v){
   $this->vecchio=$this->nuovo;
   $this->nuovo=$v;
}
function get(){
  $obj['vecchio']=$this->vecchio;
  $obj['nuovo']=$this->nuovo;
  return $obj;
}
}

I call the class and assign it at the session

Code Select Expand


$cart =new Cart();
$_SESSION['cart']=$cart;

And i print the $_SESSION:

Code Select Expand

Array (
[session_value] => 0f565ed469f2d82f9d246227fcce4164
[cart] => Cart Object (
  [nuovo] => 0
  [vecchio] => 0
  )
)
The session was create.

When i send a value for VAR nuovo, i obtain

Code Select Expand

Array (
[session_value] => 0f565ed469f2d82f9d246227fcce4164
[cart] => Cart Object (
  [nuovo] => 1
  [vecchio] => 0
  )
)
so, the class will work and olso the session.

But if now i send a new value for VAR nuovo, i must obtain [nuovo] => 2 [vecchio]=> 1.

But is not what i obtain:

Code Select Expand

Array (
[session_value] => 0f565ed469f2d82f9d246227fcce4164
[cart] => Cart Object (
  [nuovo] => 2
  [vecchio] => 0
  )
)

WHY?

Maybe the SMF clea eachtime the session??

[Arantor]

How exactly are you trying to integrate them? SMF does its own session management too.

[MarcoK]

Yes i have see.

In fact, i must use the session of smf, by create a new cell: $_SESSION['cart'].


My intention is only use a session to save data from fwcart. And i have made a plugin that open a new page and show the items to sell.

How i can exam the SMF session managment?

Thanks for your answer

[MarcoK]

I have found into Sources/load.php
these function:

sessionWrite and SessionRead.

I think i must use those function to manage the session into SMF. But there is a tutorial to learn how i must proceed?

[Arantor]

First up, are you loading SSI.php at all? This will kick in SMF's session functions. Then you just use $_SESSION, no need to session_start() or whatever.

[MarcoK]

Hum... i'have try to require SSI.php into my file but probably it will alrady loaded becose php alert my that the function ssi_shutdown() was alrady declared.

I'm not working on external file but on an mod of SMF.

I must use a session into a this mod.

[Arantor]

If you're using a mod, you should just be able to call $_SESSION directly. No extra work, no session_start, just use $_SESSION.

[MarcoK]

There is something wrong!

If I use only $_SESSION it will not function!
Maybe i do a mistake into a class call?

[Arantor]

Please define "will not function"

SMF starts its own sessions, $_SESSION is a superglobal variable meaning it is always available.

[MarcoK]

Ok.

The code in the first post is into a shop.php in source directory, called by a menu: index.php?action=shop.

The complate function on shop.php is:

Code Select Expand

function shop(){
global $obj;

$cart=& $_SESSION['cart'];
$cart =new Cart();

if($_POST['val']){
$cart->add($_POST['val']);
}

$obj=$cart->get();
}


In the shop.template.php

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function template_main(){
global $obj;

echo 'Nuovo:'.$obj['nuovo'].' --- Vecchio:'.$obj['vecchio'];

echo'<a href="?action=shop&amp;val=1">Valore 1</a><a href="?action=shop&amp;val=2">Valore 2</a>';
}

When i click on Val1, the script (i think) save into $_SESSION by the class Cart()  $_SESSION['Nuovo']=1 and $_SESSION['Vecchio']=0;

It's right, and function as well, in fact, when i print_r($_SESSION):

Code Select Expand

Array (
[session_value] => 0f565ed469f2d82f9d246227fcce4164
... other value...
[cart] => Cart Object (
  [nuovo] => 1
  [vecchio] => 0
  )

Now, when i click on Val2, I want to get $_SESSION['Nuovo']=2 and $_SESSION['Vecchio']=1.

but it is not!!!

The session reset my value and I get on print_r($_SESSION):

Code Select Expand

Array (
[session_value] => 0f565ed469f2d82f9d246227fcce4164
... other value...
[cart] => Cart Object (
  [nuovo] => 2
  [vecchio] => 0
  )

Why? If I create a file width this code, che Session and the class work right!!!! Why not into SMF?

[Arantor]

Try turning off database driven sessions in the admin panel.

[MarcoK]

Yesterday evening i have do same test.

The $_SESSION work correctly if i not use the class.

If i assigne the value normally such as:

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if(isset($_SESSION['cart'])){
$cart=$_SESSION['cart'];
}
if($_GET['val']){
$cart['vecchio']=$cart['nuovo'];
$cart['nuovo']=$_GET['val'];
}
$_SESSION['cart']=$cart

the value are memorized.
But if i assign at the session the new Cart(), where Cart() was a class, it will reset any value.

Now i think the touble is the vars declaration into a class.

But in the orignal wfCart class, the declaration of vars in this method work correclty.

I try to turning off database driven sessions. I hope....

[Arantor]

Yeah, serialize'ing objects isn't very clever, generally.

[MarcoK]

Ok, aslo turning of the database session have no good result.

Any suggestion for resolving?

[Arantor]

Not storing an object in the session would solve everything, because what's happening is when the object is unserialized, it's not holding the exact object, it's instancing a new one.