sending objects from page to page

[sinista]

hey,

 

if I create an object on one page how do I send it to another page?

 

thanks

[JonnoTheDev]

Store it in a session

<?php
session_start();
$x = new foobar();
$_SESSION['object'] = $x;
?>

Generally used for the likes of shopping carts

[sinista]

k, cheers:)

 

am I doing this right?

 

if I set the object as a session variable I to serialise it into a string first then unserialize in on the next page?

[JonnoTheDev]

You are correct, however I think this is done automatically when the session variable is registered. Not had to use the serialize() function when registering objects

[sinista]

 

I don't know what I have done, but if I try and echo the sessions var on the next page it is empty,

but I can see the variables have been created by using print_r()

 

I would seem that its easier (for me any way) to post a reference to the object around, thanks for your help though.

[JonnoTheDev]

Remember you must use session_start() on all pages that require access to session data. Are you familiar with sessions?

[sinista]

yeah the sessions started,

 

I'm kind of making progress though if I echo the session var on the next page I get a 'could not convert to string error'

 

if I wrap it in serialise() i can see my object

 

 

[JonnoTheDev]

echo the session var on the next page

You dont echo objects

<?php
// page1.php
session_start();
$x = new foobar();
$x->name = "John Doe";
$_SESSION['object'] = $x;
header("Location:page2.php");
exit();
?>

<?php
// page2.php
session_start();
echo $_SESSION['object']->name;
?>

[sinista]

thanks neil you fixed it,

 

one other thing it doesn't work unless I include the original class (on the second page), before you start the session?

 

I was under the impression that you should start the session first if your using them?

 

Thanks again

 

 

[PFMaBiSmAd]

The class definition needs to exist before the session_start() so that the object can be recreated correctly.

 

I was under the impression that you should start the session first if your using them?

The only requirement is that the session_start() must come before any output is sent to the browser. Including/defining any classes/functions/settings that are used on the page can be thought of as an initialization/setup step for the page and generally should be done before the page actually does something (like a session_start() statement.)

[sinista]

I got another question about objects when do they get disposed and does everything created through them die with them?

 

I have a method that set a session variable then returns a value, if I change the page I cant use the variable, so where has it gone? I've tried this with a cookie to and they both disappear.

[PFMaBiSmAd]

Both a $_SESSION variable and a class variable (with the instance of the class in a session variable) would be available when the session is resumed, assuming your session is actually being started  and resumed.

 

It would take seeing the code that is not working to be able to determine what it might be doing that is causing the symptom and are you developing and debugging php code on a system with error_reporting set to E_ALL and display_errors set to ON in your master php.ini so that php would help you by displaying all the errors it detects?