CodeIgniter file uploading class

We can upload files very simple CodeIgniter File Uploading Class permits files to be uploaded. You can set different preferences,

restricting the file type and size of the files.

Follow this step :-

Create The Upload form in HTML And save .php Extension
Create The Controller in Codeigniter
Create The Upload Directory

Using any text editor, create a form called uploads-form.php. In it place this code and save it to your application/views/ Directory :-

Add the following code to uploads-form.php

<html>
   <head>
      <title>Upload Form Stack Overlode</title>
   </head>
   <body> 
   <?= form_open_multipart('imageupload/do_upload');?> <input type="file" name="userfile" size="20" /> 
   <br /><br /> 
   <input type="submit" value="upload" /> 
   </form> 
   <?= form_close() ?>
</html>

Create a controller application/controllers/Imageupload.php ,The controllers name must start with uppercase letter but we need to write lowercase letter when we call that controller by URI

And Add the following code to Imageupload.php

<?php defined('BASEPATH') OR exit('No direct script access allowed');
class Imageupload extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->helper(array('form', 'url'));
    }
    public function index() {
        $this->load->view('upload_form', array('error' => ' '));
    }
    public function do_upload() {
        $config['upload_path'] = './uploads/';
        $config['allowed_types'] = 'gif|jpg|png';
        $config['max_size'] = '';
        $config['max_width'] = '';
        $config['max_height'] = '';
        $this->load->library('upload', $config);
        if (!$this->upload->do_upload('userfile')) {
            $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);
        }
    }
}

Preferences

The following preferences are available on file upload . The default value indicates what will be used if you do not specify that preference file upload.

Preference	Default Value	Options	Description
upload_path	None	None	The path to the directory where the upload file should be placed. The directory must be permission writable and the path can be absolute or relative.
allowed_types	None	None	The mime types corresponding to the types of files you allow to be uploaded. Usually the file extension can be used as the mime type. Can be either an array or a pipe-separated string. Ex: jpg\|png\|gif
file_name	None	Desired file name	The extension provided in the file name must also be an allowed file type. If no extension is provided in the original file name will be used.