if else statement wont working with session and data

Im have if else statement with session and data get from database, and want to show string but im stuck the string wont show. Any help will appreciate, thankyou.

Note: Im use Codeigniter

This is view

<?php
foreach($casis as $casiss):
$sdhupload = $casiss['sdhupload']; // Y/T
$session = $this->session->userdata("user_upload"); // T

if($session == 'T' && $sdhupload == 'T'):
echo '1';
foreach($casis as $casiss):  
echo $casiss['sdhupload']; endforeach;
elseif($session == 'T' || $sdhupload == 'Y'):
echo '2';
foreach($casis as $casiss):  echo $casiss['sdhupload']; endforeach;
elseif($session == 'T'):
echo '3';
else:
echo '4';
endif;

endforeach;
?>

This is model

function datacasis(){
        $id = $this->session->userdata('user_id');

        $this->db->where('id_akuncasis',$id);
        $datacasis= $this->db->get('tb_casis');

        return $datacasis->result_array();    
    }

Controller

public function index()
{
$data["casis"] = $this->m_datacasis->datacasis();

        $this->load->view('casis/v_dashboardcasis', $data);    
}