Upload Photo Failed Codeigniter - php

Question

This is my code, my photo can't be inserted into the database.
Actually I want to make an online exam with the codeigniter. I want to upload the question with the pic. but when I tried to upload the pict, the code is not working.
but the question success inserted into the database. only the pict failed to upload
Controller:
function insert(){
$nama_asli = $_FILES['userfile']['name'];
$config ['file_name'] = $nama_asli;
$config ['upload_path'] = './images';
$config ['allowed_types'] = 'gif|jpg|png|jpeg';
$config ['max_size'] = '2500';
$this->load->library('upload', $config);
$upload_data = $this->upload->data();
$file_name = $upload_data['file_name'];
$id_soal = '';
$soal = $_POST['soal'];
$a = $_POST['a'];
$b = $_POST['b'];
$c = $_POST['c'];
$d = $_POST['d'];
$kunci = $_POST['kunci'];
$status = $_POST['status'];
$data = array(
'id_soal' => $id_soal,
'soal' => $soal,
'a' => $a,
'b' => $b,
'c' => $c,
'd' => $d,
'kunci' => $kunci,
'status' => $status,
'foto' => $file_name,
);
$hasil = $this->soal_model->Simpan('soal', $data);
if($hasil>=1){
redirect('dashboard/index', $data);
}
}
Model:
class Soal_model extends Ci_Model {
public function Ambil($where= "") {
$data = $this->db->query('select * from soal '.$where);
return $data;
}
public function Simpan($tabel, $data){
$res = $this->db->insert($tabel, $data);
return $res;
}
View:
<form role="form" action="<?php echo base_url(); ?>dashboard/insert" method="POST" enctype="multipart/form-data">
<form class="form-horizontal" method="post" style = "margin : 10px;">
<div class = "row">
<div class = "col-sm-offset-3 col-sm-6">
<div class="form-group">
<label>Soal :</label>
<textarea type="text" class="form-control" name="soal" id="soal" required></textarea>
</div>
<div class="form-group">
<label>Jawaban A :</label>
<input type="text" class="form-control"
placeholder="Type Here" name="a" id="a" required/>
</div>
<div class="form-group">
<label>Jawaban B :</label>
<input type="text" class="form-control"
placeholder="Type Here" name="b" id="b" required/>
</div>
<div class="form-group">
<label>Jawaban C :</label>
<input type="text" class="form-control"
placeholder="Type Here" name="c" id="c" required/>
</div>
<div class="form-group">
<label>Jawaban D :</label>
<input type="text" class="form-control"
placeholder="Type Here" name="d" id="d" required/>
</div>
<div class="form-group">
<label>Kunci :</label>
<select name="kunci" id="kunci" class="form-control">
<option>Select</option>
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
</select>
</div>
<div class="form-group">
<label>Status :</label>
<select name="status" id="status" class="form-control">
<option value="">Select</option>
<option value="tampil">Tampil</option>
<option value="tidak">Tidak</option>
</select>
<div class="form-group">
<label>Photo :</label>
<input type="file" name="foto" id="foto" size="20"/>
</div>
<br>
<div class="form-group">
<button type="submit" class="btn btn-default">Simpan</button>
<button type="reset" class="btn btn-default">Hapus</button>
</div>
</div>
</div>
</form>
Database:

Answer 1

Kindly use this code
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Dashboard extends CI_Controller{
function __construct(){
parent::__construct();
$this->load->model('soal_model');
}
function insert()
{
$config =array(
'upload_path' => './images',
'allowed_types' => 'gif|jpg|png|jpeg',
'max_size' => '2500',
);
$this->load->library('upload', $config);
$this->upload->do_upload('file_upload');
$upload_data = $this->upload->data();
$file_name = $upload_data['file_name'];
$data = array(
'foto' => $file_name,
);
$hasil = $this->soal_model->Simpan('soal', $data);
if($hasil>=1){
redirect('dashboard/index', $data);
}
}
?>