Passing objects between pages in a session

[ramsy]

I'm trying to pass an object onto different pages within a session.
The object that is created is to give a user some utilities to work with. The definition of the class is in the file 'ezconnection.php'.
My code looks like this:

frm_user.php:
<?php
include_once('ezconnection.php');
session_start();
...
if(!session_is_registered("objconnection")){
session_register("objconnection");
}
$objconnection = new ezconnection(HOST, DB, WEBUSER, WEBPASSWORD);
$compact_objconnection=serialize($objconnection);
?>

change_personal.php:
<?
...
$objconnection=unserialize($compact_objconnection);
$qry_personalia="SELECT * FROM e_persons INNER JOIN e_projects_persons ON e_persons.projects_persons_fk=e_projects_persons.e_projects_persons_pk
WHERE e_persons_pk='$e_persons_pk'";
$objconnection->set_query($qry_personalia);// line 17
...
?>

Every time I try to access the link I get the following error:
Fatal error: Call to a member function on a non-object in change_personal.php on line 17

Do I need to serialize and unserialize the object or not?
And if so, why is going wrong here?
Final comment: 'change_personal.php' is reached through a href="change_personal.php" link in frm_user.php.

Please help.
Thank you.

[renaun]

If you are using sessions and use session_register() to register objects, these objects are serialized automatically at the end of each PHP page, and are unserialized automatically on each of the following pages. This basically means that these objects can show up on any of your pages once they become part of your session.

It is strongly recommended that you include the class definitions of all such registered objects on all of your pages, even if you do not actually use these classes on all of your pages. If you don't and an object is being unserialized without its class definition being present, it will lose its class association and become an object of class stdClass without any functions available at all, that is, it will become quite useless.

So if in the example above $a became part of a session by running session_register("a"), you should include the file classa.inc on all of your pages, not only page1.php and page2.php.

That might be the problem, is "include_once('ezconnection.php');" at the top of change_personal.php page?

No the way I would do this whole thing is like this:

frm_user.php

<?php
include_once('ezconnection.php'); 
session_start();

$_SESSION['objConn'] = new ezconnection(HOST,DB,WEBUSER,WEBPASSWORD);
?>

change_personal.php

<?php
include_once('ezconnection.php'); 

$objconnection = $_SESSION['objConn'];
$qry_personalia="SELECT * FROM e_persons INNER JOIN e_projects_persons ON e_persons.projects_persons_fk=e_projects_persons.e_projects_persons_pk 
WHERE e_persons_pk='$e_persons_pk'"; 
$objconnection->set_query($qry_personalia);// 
?>

You dont have to serialize the objects as they are automatically serialized for sessions.