Question: SESSION and ARRAY

[eluser]Unknown[/eluser]
Hello all,

i have a questen to SESSION and ARRAY with CI. I should like to use array in session. Here example use without CI.

Code:

$_SESSION['name'][$_POST['title']] = array($_POST['description'], $_POST['number_of'], $_POST['place']);

This work good .

The example with CI.

Code:

$Name['Name'][$this->input->post('title')] = array($this->input->post('description'), $this->input->post('number_of'), $this->input->post('place'));
$this->session->set_userdata($Name);

This doesn´t work.
I am overwride the old content.