PHP object serialization and Sessions

Question

How is it possible to serialize sub-objects to $_SESSION? Here is an example of what I'm trying:

arraytest.php:

<?php

class ArrayTest {
    private $array1 = array();
    public function __construct(){
        $this->array1[] = 'poodle';
    }
    public function getarray(){
        return $this->array1;
    }
}

class DoDoDo {
   public $poop;
   public function __construct(){
        $poop = new ArrayTest();
    }
    public function foo()
    {echo 'bar';}
}

?>

Page 1:

<?php
require_once('arraytest.php');
session_start();
$bob = new DoDoDo();
$_SESSION['bob'] = serialize($bob);
?>

Page 2:

<?php
require_once('arraytest.php');
session_start();
$bob = unserialize($_SESSION['bob']);
$bob->foo();
print_r($bob->poop->getarray()); // This generates an error.
?>

Somehow when I deserialize the object, the ArrayTest instance assigned to the objects's $poop property in page 1 doesn't exist any more, as evidenced by the fact that page 2 generates a fatal error on the marked line:

Fatal error: Call to a member function getarray() on a non-object in on line 6

Tried to change them when I saw they weren't politically correct. Seems I failed. Will not do it again. — Olivier Tremblay
– Olivier Tremblay, Commented Apr 6, 2009 at 16:25
Exemplary sample code; clear, concise, just the sort of thing you look for when answering a question. I'm glad you weren't able to change the variable names. — outis
– outis, Commented Jan 20, 2013 at 19:31

Frank Crook · Accepted Answer · 2009-04-06 16:22:24Z

7

Your problem isn't serialization. Class dododo's constructor has a bug. You aren't referencing the class object, but instead are referring to a new variable "poop" inside of the constructor's namespace. You're missing a $this->.

class dododo{
   public $poop;
   public function __construct(){
        $this->poop = new arraytest();
    }
    public function foo()
    {echo 'bar';}
}

It works fine with this change.

answered Apr 6, 2009 at 16:22

Frank Crook

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1 Comment

Olivier Tremblay Over a year ago

Thanks alot! Will slap myself on wrist for "this". This is me, not being proud of my mistake. -_-

vartec · Accepted Answer · 2009-04-06 16:25:27Z

2

It has got nothing to do with serialization. It doesn't exist in the first place. You've got it wrong in the constructor, should be:

   public function __construct(){
        $this->poop = new arraytest();
    }

answered Apr 6, 2009 at 16:25

vartec

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1 Comment

Olivier Tremblay Over a year ago

Thanks to you too. Won't do that mistake again.

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