如何在不带格式的codeigniter中将文本框值直接赋值给session

$this->load->library('session');

<form method="post" action="<?php echo base_url('controller/method'); ?>">
    <input type="text" name="textbox" />
    <input type="submit" value="Submit" />
</form>

public function method()
{
    $textboxValue = $this->input->post('textbox');
    $this->session->set_userdata('textboxValue', $textboxValue);
}

public function anotherMethod()
{
    $textboxValue = $this->session->userdata('textboxValue');
    // 使用$textboxValue进行后续操作
}