codeigniter 3.1.9 session failure

PHP Code:

<?php 
defined('BASEPATH') OR exit('No direct script access allowed');

class Requestpage extends CI_Controller
{
    // set public or private
    public $data = null;

    //    Constructor
    public function __construct() {
        //    init construct
        parent::__construct();
        //    Pre-loading libs & helpers & models
        $this->load->model('requestpage_model');
        $this->load->library('sms');
        $this->load->library('email');
    };

    //    Base page
    public function index() {
        //getting all services types
        $this->data = [
            'services_list' => $this->requestpage_model->get_allservices(),
            'payments_list' => $this->requestpage_model->get_allpaymenttypes(),
            // 'data' => ($services_list) // I do not understand why you need the same data as in "services_list" , just delete it and refer to $data["services_list"]
        ];
        //var_dump($services_list);
        $this->load->view('requestpage', $this->data);
        //    Clear memory...
        unset($this->data);
    };

    //    ###
    public function insert_cont() {
        //getting the cureent date and time
        $currentDateTime = date('Y-m-d H:i:s');
        //populating the status of new entry
        $new_entry = "new pending action";
        //we now getting information for the files to be saved
        $this->data = [
            //    ##############
            ['File_Info'] => [
                //    file name
                'name' => $_FILES['id_attachment']['name'],
                //    file type
                'type' => $_FILES['id_attachment']['type'],
                //    file size
                'size' = $_FILES['id_attachment']['size'],
                //    temporary location
                'tem_loc' = $_FILES['id_attachment']['tmp_name'],
                //    path for saving uploads
                'store' = "upload/".$file_name
            ],
            //    ##############
            ['Input_Info'] => [
                "salutation" => $this->input->post('salutation'),
                "first_name" => $this->input->post('first_name'),
                "last_name" => $this->input->post('last_name'),
                "id_type" => $this->input->post('id_type'),
                "id_number" => $this->input->post('id_number'),
                "address" => $this->input->post('address'),
                "contact_number" => $this->input->post('contact_number'),
                "other_number" => $this->input->post('other_number'),
                "email" => $this->input->post('email'),
                "service_id" => $new,
                "attachment" => $_FILES['id_attachment']['name'],
                "comment" => $this->input->post('comment')
            ],
            //     ##############
            ['Assigned'] => [
                "assigned_to" => "zamtel",
                "assigned_by" => "customer",
                "date_entered" => $currentDateTime,
                "date_updated" => $currentDateTime,
                "payment_type" => $this->input->post('payment_options'),
                "receipt_number" => $this->input->post(''),
                "comment" => $this->input->post('comment')
            ]
        ];
        //    Moving uploads
        move_uploaded_file($this->data['File_Info']['tem_loc'], $this->data['File_Info']['store']);
        $new = 1;
        // $this->load->view('packages', $this->data['your_key']);
        session_start();

        //    CHANGE THIS SESSION DATA ON U PARAMETERS WITH USING $THIS->DATA->[KEY]
        $_SESSION = [
            ['customer_data1'] => $this->data['key1'],
            ['customer_data2'] => $this->data['key2']
        ];
        redirect('packages');
        //    Clear memory...
        unset($this->data);
    };
}
?>

I'm not much of a codebreaker, and it's a little annoying, but for you, I made a huge exception... There is one thing, but correct a little code at the end of the method "insert_cont ()", so that the data was saved correctly !

UPD: Working with a database or sessions in controllers according to the PHP (H)MVC standard is not good, for good practice I recommend to study the model system and work in them, and transfer ready - made data to the controller on request.

P.S. Sorry my English 

I would change this world, but God doesn't give me the source.