how to combinate $session and classes in a php webpage

mv_gonzalez

Hello,

I amb developing a web in php with xajax, and I've got some classes.

My idea is the following: when a person logs in the webpage, it creates a session and I fill and object with the characteristics of the user (this object is from a class).

The problem I have is that $session can't save ans instance of an object (or I don't know how this can be done). I mean, it's possible to do "$session["myVar"]=new myClass()" ? An thats why everytime the user goes from one side to another of the web, I have to instance the object again and again, and I think that this it is not necessary cause the characteristics of the user doesn't change.

If it's not I don't know how can I make a modular webpage if sessions and classes are not compatible. Can someone help me?

Thanks in advance

Maria

88valve

I made this example:

<?php

session_start();

class Pla {
	public $name = 'none';
	public $age = 0;
}

$john = new Pla();
$john->name = 'John Smith';
$john->age = '33';

$_SESSION['john'] = $john;

print_r($_SESSION);

/* will output this:

Array
(
    [john] => Pla Object
        (
            [name] => John Smith
            [age] => 33
        )

)
 */

bradgrafelman

mv.gonzalez wrote:
The problem I have is that $session can't save ans instance of an object

PHP sessions can indeed store objects, with two caveats:

As the introduction section of the Session part of the manual (link: [man]intro.session[/man]) states:

PHP Manual wrote:
Some types of data can not be serialized thus stored in sessions. It includes resource [link: [man]types.resource[/man]] variables or objects with circular references (i.e. objects which passes a reference to itself to another object).
In order for PHP to unserialize the stored data back into an object, the class definition must be loaded before the session is started again. In other words, the caution text on the same manual page as above applies:

PHP Manual wrote:
If you turn on [man]session.auto_start[/man] then the only way to put objects into your sessions is to load its class definition using [man]auto_prepend_file[/man] in which you load the class definition else you will have to [man]serialize/man your object and [man]unserialize/man it afterwards.

mv_gonzalez

Ok Thanks. I've done that and it works, but when the value is lost when an event occurs.

I'll explain:

I have a webpage with a lot of divs, and when a button is pressed or a form is completed, etc. An xajax function changes the content of the divs, and if I look for the value of $_SESSION["myVar"] it ios empty, and if I use the isset function, it cretes it again.

Why is it disapearing? Can you help me?

Thanks.