Filter File Upload

/* -- new_ticket -- */
    public function new_ticket()
    {
        if (!$this->ion_auth->logged_in())
        {
            $this->session->set_flashdata('message', 'You must be an administrator to view this page.');
            redirect(''.base_url().'', 'refresh');
        }

        error_reporting(0);

        $Sample_Ticket = $_FILES['uploadedimages_ticket'];
        if ((is_uploaded_file($SampleTicket)) && (isset($_FILES['uploadedimages_ticket'])) && !empty($_FILES['uploadedimages_ticket']['name'])) {
            $this->form_validation->set_rules('uploadedimages_ticket[]','Upload Berkas','callback_fileupload_berkas');
        }
        $this->form_validation->set_rules('ticket_sla', 'Urgency', 'required');
        $this->form_validation->set_rules('ticket_subject', 'Subject', 'required');
        $this->form_validation->set_rules('ticket_assign_to', 'Assign Name', 'required');

        if ($this->form_validation->run() == true)
        {
            if ($this->_valid_csrf_nonce() === TRUE)
            {
                if ( !empty($this->input->post('uploadedimages_ticket[]'))) {
                    $SampleTicket = $_FILES['uploadedimages_ticket']['name'];
                    foreach ($SampleTicket as $key => $value)  {
                        $data_ticket = array(
                            'ticketnumber' => $this->input->post('ticket_no'),
                            'sla' => $this->input->post('ticket_sla'),
                            'reporteddate' => $this->input->post('ticket_date'),
                            'reportedduedate' => $this->input->post('ticket_due_date'),
                            'telp' => $this->input->post('ticket_tlp'),
                            'email' => $this->input->post('ticket_email'),
                            'image_from' => var_dump($_FILES['uploadedimages_ticket']),
                            'problemdetail' => $this->input->post('ticket_subject'),
                            'ticketstatus' => 'Assigned',
                            'assignee' => $this->input->post('ticket_assign_to'),
                        );
                        $this->m_ticket->m_new_ticket($data_ticket);
                        $this->session->set_flashdata('message_success', 'Data berhasil ditambahkan');
                        redirect("ListHD", 'refresh');
                    }
                } else {
                    $data_ticket = array(
                        'ticketnumber' => $this->input->post('ticket_no'),
                        'sla' => $this->input->post('ticket_sla'),
                        'reporteddate' => $this->input->post('ticket_date'),
                        'reportedduedate' => $this->input->post('ticket_due_date'),
                        'telp' => $this->input->post('ticket_tlp'),
                        'email' => $this->input->post('ticket_email'),
                        'image_from' => '',
                        'problemdetail' => $this->input->post('ticket_subject'),
                        'ticketstatus' => 'Assigned',
                        'assignee' => $this->input->post('ticket_assign_to'),
                    );
                    $this->m_ticket->m_new_ticket($data_ticket);
                    $this->session->set_flashdata('message_success', 'Data berhasil ditambahkan');
                    redirect("ListHD", 'refresh');
                }
            }
        } else {
            redirect("ChangePass", 'refresh');
        }
    }