PHP object serialization and unserialization not working properly

Question

I have 3 source files as follows:

first one is source_class.php

class MacMini
{
    public $memory = "16 Gigabytes";
    public $cpu = "Intel Core i7 @ 2.6GHz";
    public $HD = "1TB @ 5200 rpms";
    public function mem()
    {
        return $this->memory;
    }
    public function centralPU()
    {
        return $this->cpu;
    }
    public function hard_drive()
    {
        return $this->HD;
    }
}

///////////////////////////////////////////////////

second one is serialize.php

include "source_class.php";
$myMini = new MacMini;
$myMini->cpu = "Intel Core i7 @ 3.4GHz";
$serialized = serialize($myMini);
file_put_contents("store", $serialized);

//////////////////////////////////////////////

third one is unserialize.php

include "source_class.php";
$data = file_get_contents("store");
$unserialized = unserialize($data);

$myMini = new MacMini;
echo $myMini->cpu;

it produces the following output: "Intel Core i7 @ 2.6GHz"

Why, if the property of the cpu was changed in the serialize.php file, is it not reflected in the unserialization? I checked the raw data contents of the serialized file, "store" and the cpu property is reflected in the serialized file but when it's unserialized in unserialize.php the property change is not reflected. Why is that? Can anyone explain?

hek2mgl · Accepted Answer · 2013-02-13 16:56:30Z

6

The problem is that you create a new $myMini object and output the cpu properity of this newly created object. The serialization/ unserialization doesn't make sense this way.

Change unserialize.php to :

include "source_class.php";
$data = file_get_contents("store");
$myMini = unserialize($data);

echo $myMini->cpu;

answered Feb 13, 2013 at 16:56

hek2mgl

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2 Comments

Robert Over a year ago

Ooh now I understand. I should've caught the logic of why. Thanks!

hek2mgl Over a year ago

You are welcome. This is the sort of errors because one should compare delivered hardware against ordered hardware when purchasing online. :) hehe

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