Cannot unserialize ci_sessions from database

My problem solved, I've use session_decode method
I've read from
http://php.net/manual/en/function.sessio...cation=ufi

And I my code program :

PHP Code:

$data = array(
            'id',
            'ip_address',
            'timestamp',
            'data'
        );
        $this->db->select($data);
        $query = $this->db->get("ci_sessions");
        foreach ($query->result() as $row)
        {   
            $session_data = $row->data;
            
            $return_data = array();
            $offset = 0;
            while ($offset < strlen($session_data)) {
                if (!strstr(substr($session_data, $offset), "|")) {
                    throw new Exception("invalid data, remaining: " . substr($session_data, $offset));
                }
                $pos = strpos($session_data, "|", $offset);
                $num = $pos - $offset;
                $varname = substr($session_data, $offset, $num);
                $offset += $num + 1;
                $data = unserialize(substr($session_data, $offset));
                $return_data[$varname] = $data;
                $offset += strlen(serialize($data));
            }
            
            if(!empty($return_data['namapengguna'])){
                echo date("d-m-Y H:i:s",$row->timestamp);
                echo $return_data['namapengguna'];
                echo $row->ip_address;
                echo $return_data['browser'];
                echo $return_data['platform'];
            }
        } 


Image result in attachment
Thanks for your help  

Above code also help me.
Thanks for your help