In this tutorial, we are going to how to generate a thumb image or resize an image using Codeigniter. Codeigniter is a PHP framework and it provides image library such as resize, rotate, crop and watermark. you can keep validation on image upload like as size and file type.

Here, we will use the GD2 library for the resize image using Codeigniter.

Creating a Project Directory

First, we have to need the 7.2+ PHP version and Apache 2.4 . after the download latest version of CodeIgniter and set up the project on the htdocs root directory. we will also create "assets/upload/product" and "assets/upload/product/thumb" directory on the project directory for the file upload.

Autoload Configuration

we will use the database, file upload, file validation, HTML in this project application. so we will configuration in the autoload.php. see below some load helpers and library in the autoload.php

$autoload['helper'] = array('html','url', 'file');
$autoload['libraries'] = array('database','form_validation');

Creating Controller Class

we will create the Resizeimage.php file in the "application/controllers" directory. first we will load the comman_model model in the constructor and after then we will crate index() and add() method.

When you the call index() method then it loads the view file and after submit the form then call the add() method.

simply we use below library load in the add() method for the file upload.

$this->load->library('upload', $config);

but, if you want to need to resize image then load the below library in the add() method.

$this->load->library('image_lib',$config); 
$this->image_lib->resize();

so. you can see below source code for resizing image.

<?php
defined('BASEPATH') OR exit('No direct script access allowed');


class Resizeimage extends CI_Controller {

	function __construct()
	{
		parent::__construct();
		$this->load->model('common_model');
	}
	public function index()
	{
		$arrData['middle'] = 'product/add';
		$this->load->view('template',$arrData);
	}
 
	/**
	* add
	*
	* This help to add slider
	* 
	* @author	Nilesh dabhi
	* @access	public
	* @return	void
	*/
	
	public function add()
	{
		 if(isset($_POST['btnProduct']))
         {
                if ($_FILES['productImage']['name'] != '')
                {
					//echo "dfdf"; die;
                    //$config['upload_path'] = $_SERVER['DOCUMENT_ROOT'].'/assets/upload/product/';
					$config['upload_path'] = './assets/upload/product/';
                    $config['allowed_types'] = 'gif|jpg|png|jpeg';
                    $config['max_size'] = '10240';
					$ext = pathinfo($_FILES['productImage']['name'], PATHINFO_EXTENSION);
					$image = 'xpertphp' . '_' . rand(10000, 100000) . '.' . $ext;
					$config['file_name'] = $image;

                
                    $this->load->library('upload', $config);
                    if (!$this->upload->do_upload('productImage'))
                    {
                        // case - failure
                        $upload_error = array('error' => $this->upload->display_errors());
                        print_r($upload_error); die;
                    }
                    else
                    {
                        $inData["product_image"] = $this->upload->file_name;
                        $data = $this->upload->data();
                        $upload_data = $this->upload->data();

                        $config = array(
                            'source_image'     => $data['full_path'], //get original image
                            'new_image'        => $data['file_path'].'thumb', //save as new image //need to create thumbs first
                            'maintain_ratio'   => true,
                            'width'            => 150
                        );
                        //print_r($config); die;
                    

                        $this->load->library('image_lib',$config); //load library
                        $this->image_lib->resize(); //do whatever specified in config

                    }//end do-upload condition
                }//end productImage empty condition
				$inData["product_title"] = $_POST['txtProductTitle'];
                $inData["product_created"] = date('Y-m-d H:i:s');

                $insertFlag	= $this->common_model->insert('product',$inData);
				if($insertFlag)
				{
					$this->session->set_flashdata('success', 'Prodcut Added Successfully !!');
						redirect('resizeimage');
				}
				else
				{
					$this->session->set_flashdata('error', 'Failed to Add Product !!');
					redirect('product/add');
				}
        }
        $arrData['middle'] = 'product/add';
        $this->load->view('template', $arrData);
	}

}

Creating  Model

here, we will create a common_modal.php in the application/models/common_modal.php.

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Common_model extends CI_Model
{
	
	public function __construct()
	{
		$this->load->database('default');
			
		// Call the Model constructor
		parent::__construct();
	}
	public function insert($table,$arrData)
	{
		  if ($this->db->insert($table, $arrData)) 
		  {
            return true;
          } else 
		  {
            return false;
          }
	}
}
?>

Creating View Files

here, first, we will create the template.php file in the "application/views/" directory and add bootstrap in that file.

After then we will create an add.php file in the "application/views/product" directory, make the form with a file field and that file we pass as the middle for the template file.

 

template.php

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Codeigniter file upload with resize image</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="shortcut icon" href="https://xpertphp.com/assets/front/images/expertxp_icon.ico">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
		<script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
		<script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>		
		<link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css" />
</head>
<body>
<div class="container">
    <div class="row">
      <div class="col-lg-12">
        <?php
          if ($this->session->flashdata('success')){
              ?>
              <div class="alert alert-success msg-success-error">
                  <!-- a title="Hide Notification" class="close-notification tooltip" href="#">x</a -->
                  <a href="#" class="close msg-close" data-dismiss="alert" aria-label="close">&times;</a>
                  <h4>Success</h4>
                  <p><?php echo $this->session->flashdata('success') ?></p>
              </div>
              <?php
          }
          ?>
          <?php
          if ($this->session->flashdata('error')){
              ?>
              <div class="alert alert-error msg-success-error">
                  <!-- a title="Hide Notification" class="close-notification tooltip" href="#">x</a -->
                  <a href="#" class="close msg-close" data-dismiss="alert" aria-label="close">&times;</a>
                  <h4>Error</h4>
                  <p><?php echo $this->session->flashdata('error') ?></p>
              </div>
              <?php
          }
          ?>
      </div>
    </div>
    <?php $this->load->view($middle);?>
</div>    
</body>
</html>

add.php

<div class="row" style="margin-bottom:10px;">
        <div class="col-lg-12"><h2>codeigniter file upload with resize image</h2></div>
</div>
<form method="post" name="frmAdd" action="<?php echo base_url('resizeimage/add'); ?>" enctype="multipart/form-data">
  <div class="form-group">
    <label for="txtProductTitle">Product Title:</label>
    <input type="text" class="form-control" name="txtProductTitle" required  id="txtProductTitle">
  </div>
  
  <div class="form-group">
    <label for="productImage">Product Image:</label>
    <input type="file" class="form-control" required name="productImage" id="productImage" accept="image/*">
  </div>
  <input type="submit" class="btn btn-success" name="btnProduct" value="Add"/>
</form>

Configuring Route

We will change the default controller as Resizeimage in the application/config/routes.php

$route['default_controller'] = 'resizeimage';

You can download our source code