serialize - unserialize and sessions

[giannitom]

When I launch the following code for the third time I have this error:
Fatal error: Call to a member function on a non-object in .../test.php on line 29 [echo($test->get_data());]
This happen only if register_global is ON
I have noticed that the content of $_SESSION['test'] became an object and not a string.

Help me please!

<?php
class test
{
	var $var = 0;

function test()
{
	if (!isset($_SESSION['test']))
	{
		// store new test object in session data
		$this->var = 1;
		$_SESSION['test'] = serialize($this);
	}
	else
	{
		//wake-up existing forum object
		$this = unserialize($_SESSION['test']);
	}
}

function get_data()
{
	return $this->var;
}
}
session_start();

$test = new test();
echo($test->get_data());
?>

[giannitom]

I have found the mistake:
with register_global ON $_SESSION['test'] and the object $test are the same thing.