Buat project baru dengan codeigniter, kemudian buka controller welcome.php, kemudian isi seperti berikut.
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');class Welcome extends CI_Controller {    public function __construct()    {        parent::__construct();        $this->load->helper(array('form', 'url', 'html'));        $this->load->library(array('upload','image_lib'));    }        public function index()    {        $data = array();        $data['error'] = '';        $data['output'] = '';                 if(isset($_FILES['userfile']))        {            $this->upload->initialize(array(                'upload_path' => './assets/',                'allowed_types' => 'png|jpg|gif',                'max_size' => '5000',                'max_width' => '3000',                'max_height' => '3000'            ));                      if($this->upload->do_upload())            {                $data_upload = $this->upload->data();                $this->image_lib->initialize(array(                    'image_library' => 'gd2',                    'source_image' => './assets/'. $data_upload['file_name'],                    'maintain_ratio' => false,                    'create_thumb' => true,                    'quality' => '20%',                    'width' => 240,                    'height' => 172                ));                                 if($this->image_lib->resize())                {                    $output = '<h4>Thumb - hasil Resize</h4>';                    $output .= img('./assets/'.$data_upload['raw_name'].'_thumb'.$data_upload['file_ext']);                    $output .= '<h4 style="margin-top: 30px">Gambar Original</h4>';                    $output .= img('./assets/'.$data_upload['file_name']);                                         $data['output'] = $output;                }                else                {                    $data['error'] = $this->image_lib->display_errors();                }                             }            else            {                $data['error'] = $this->upload->display_errors();            }        }                 $this->load->view('welcome_message', $data);    }}/* End of file welcome.php *//* Location: ./application/controllers/welcome.php */  | 
<!DOCTYPE html><html lang="en"><head>    <meta charset="utf-8">    <title>Welcome to CodeIgniter</title>    <style type="text/css">    ::selection{ background-color: #E13300; color: white; }    ::moz-selection{ background-color: #E13300; color: white; }    ::webkit-selection{ background-color: #E13300; color: white; }    body {        background-color: #fff;        margin: 40px;        font: 13px/20px normal Helvetica, Arial, sans-serif;        color: #4F5155;    }    a {        color: #003399;        background-color: transparent;        font-weight: normal;    }    h1 {        color: #444;        background-color: transparent;        border-bottom: 1px solid #D0D0D0;        font-size: 19px;        font-weight: normal;        margin: 0 0 14px 0;        padding: 14px 15px 10px 15px;    }    code {        font-family: Consolas, Monaco, Courier New, Courier, monospace;        font-size: 12px;        background-color: #f9f9f9;        border: 1px solid #D0D0D0;        color: #002166;        display: block;        margin: 14px 0 14px 0;        padding: 12px 10px 12px 10px;    }    #body{        margin: 0 15px 0 15px;    }         p.footer{        text-align: right;        font-size: 11px;        border-top: 1px solid #D0D0D0;        line-height: 32px;        padding: 0 10px 0 10px;        margin: 20px 0 0 0;    }         #container{        margin: 10px;        border: 1px solid #D0D0D0;        -webkit-box-shadow: 0 0 8px #D0D0D0;    }    </style></head><body><div id="container">    <h1>Upload dan Resize Gambar Otomatis <span style="float: right">Dida Nurwanda</span></h1>    <div id="body">        <form method="post" enctype="multipart/form-data">                                 <?php echo $error; ?>                         <div>                <label for="userfile">Pilih gambar yang akan di upload : </label>                <br />                <input type="file" name="userfile" />            </div>                         <div style="margin-top:20px">                <input type="submit" value="Upload" />            </div>                 </form>                 <div>            <?php echo $output; ?>        </div>    </div>    <p class="footer">Page rendered in <strong>{elapsed_time}</strong> seconds</p></div></body></html> 
Selesai deh, kodenya berantakan tapi mudah di pahami. Kalo bingung mau nambah-nambahin silahkan bertanya :D
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