Not displaying error when using upload multi file in codeigniter 2.0 - codeigniter

Question

I'm very new in codeigniter. I have a problem when upload multi file in codeigniter.
My upload form can upload multi files, resize and save them to database, everything is Ok, only one thing is not ok : not display error. Example: maximum file is 2MB, i choose file 3MB, it's not display message "The file you are attempting to upload is larger than the permitted size." The same error when i click button upload but not choose a file. The view will display like a image as link. (i'm not enought reputation to post images)
https://drive.google.com/file/d/0B2zpQIbKaLa6Z2Z6LXFrNXlVRUk/view?usp=sharing
This is my Controller:upload.php
private function _upload_files($field='userfile'){
$files = array();
foreach( $_FILES[$field] as $key => $all )
foreach( $all as $i => $val )
$files[$i][$key] = $val;
$files_uploaded = array();
for ($i=0; $i < count($files); $i++) {
$_FILES[$field] = $files[$i];
if ($this->upload->do_upload($field))
$files_uploaded[$i] = $this->upload->data($files);
else
//$files_uploaded[$i] = null;
$files_uploaded[$i] = $this->upload->display_errors();
}
return $files_uploaded;
}
public function do_upload(){
$data['error']="";
$this->_data['loadPage']="upload/upload_view";
$this->load->model('Mcategorie');
$this->_data["categories"] = $this->Mcategorie->listAllCate();
$this->load->model('Malbum');
$this->_data['albums']=$this->Malbum->listAllAlbum1();
$user_folder = './uploads/'.$this->session->userdata('username');
$thumb_folder = './uploads/'.$this->session->userdata('username').'/thumbnail/';
if(!is_dir($user_folder)){
mkdir($user_folder, 0777);
}
if(is_dir($user_folder)){
if(!is_dir($thumb_folder))
mkdir($thumb_folder,0777);
}
if($this->input->post("ok")){
$config['upload_path'] = $user_folder;
$config['allowed_types'] = 'gif|jpg|png|jpeg';
$config['max_size'] = '2048';
$config['max_width'] = '';
$config['max_height'] = '';
$config['overwrite'] = FALSE;
$config['remove_spaces'] = TRUE;
$this->load->library("upload",$config);
$this->load->library("image_lib");
if ($_FILES['image_list']) {
$images_upload= $this->_upload_files('image_list');
//echo "<pre>";
//print_r($images_upload);exit;
foreach($images_upload as $data){
$config['image_library'] = 'gd2';
$config['source_image'] = './uploads/'.$this->session->userdata('username').'/'.$data['file_name'];
$config['create_thumb'] = TRUE;
$config['new_image'] = './uploads/'.$this->session->userdata('username').'/thumbnail/'.$data['file_name'];
$config['maintain_ratio'] = FALSE;
$config['width'] = 400;
$config['height'] = 300;
$this->image_lib->initialize($config);
$this->image_lib->resize();
$file = array(
'name' => $data['raw_name'].$data['file_ext'],
'thumb_name' => 'thumb_'.$data['raw_name'].$data['file_ext'],
'date' => date("Y-m-d"),
'userid' => $this->session->userdata('userid'),
'username' => $this->session->userdata('username'),
'description' => $this->input->post("description"),
'roleid' => $this->session->userdata("roleid"),
'public' => $this->input->post("kiet"),
'albumid' => $this->input->post("album"),
'categoryid' => $this->input->post("cat"),
);
$this->Mupload->insert_images($file);
}
redirect(base_url()."default/user/profile","refresh");
}
}
$this->load->view ( $this->_data['path'], $this->_data);
}
This is my view: upload_view.php
<div class="upload container col-xs-12 col-sm-12 col-md-12 col-lg-12">
<div class="panel panel-info">
<div class="panel-heading"><strong>Upload Files</strong> <small>Sao Bac Dau Photo Sharing</small></div>
<div class="panel-body">
<!-- Standar Form -->
<form action="<?php echo base_url()."default/upload/do_upload"?>" method="post" enctype="multipart/form-data">
<div class="col-xs-6 col-sm-6 col-md-6 col-lg-6">
<label> Chọn file ảnh cần upload (jpg, jpeg, gif, png) : </label>
<div class="error col-xs-12 col-sm-12 col-md-12 col-lg-12 clear-css" style="color:#FF0081; font-weight: bold">
<?php if(isset($error)){echo $error; }?>
</div>
<div class="input-group">
<span class="input-group-btn" >
<span class="btn btn-primary btn-file">
Browse … <input type="file" multiple id="image_list" name="image_list[]" accept="image/*" >
</span>
</span>
<input type="text" class="form-control" readonly>
</div>
<input type="submit" name="ok" class="btn btn-md btn-primary" value="Upload Photo" >
</div>
</form>
</div>
</div>
What should i do to display error ? Sorry if my english is so bad. thank in advance for your help.

Answer 1

You will store error in $files_uploaded[$i] = $this->upload->display_errors(); but not use of this to display error so you need to fetch error from this array and display it on view.
Please see below code.
<?php
class Upload extends CI_Controller {
function __construct()
{
parent::__construct();
$this->load->helper(array('form', 'url'));
}
function index()
{
$this->load->view('upload_form', array('error' => ' ' ));
}
function do_upload()
{
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = '100';
$config['max_width'] = '1024';
$config['max_height'] = '768';
$this->load->library('upload', $config);
if ( ! $this->upload->do_upload())
{
$error = array('error' => $this->upload->display_errors());
$this->load->view('upload_form', $error);
}
else
{
$data = array('upload_data' => $this->upload->data());
$this->load->view('upload_success', $data);
}
}
}
?>