README

This project helps you upgrade your CodeIgniter3 apps to CodeIgniter4.

• The goal is to reduce upgrade costs.
• It provides compatible interfaces for common use cases in CodeIgniter3 apps.
• It also provides compatible interfaces to test code using ci-phpunit-test.
• It does not aim to be 100% compatible.
• This project is under early development.
• This project is under early development.
  • We welcome Pull Requests!

Requirements

• CodeIgniter 4.3.1 or later
  • ci4-app-template can be used
• PHP 7.4 or later

Sample Code

• https://github.com/kenjis/ci3-to-4-news
• https://github.com/kenjis/ci3-to-4-news/tree/main/tests/app
• https://github.com/kenjis/ci4-online-games-store
• https://github.com/kenjis/ci4-qrcode
• (Japanese) https://github.com/kenjis/ci4-tettei-apps

If you use ci3-to-4-upgrade-helper, You can run the following code on CodeIgniter4.

app/Controllers/News.php

<?php
namespace App\Controllers;

use App\Models\News_model;
use Kenjis\CI3Compatible\Core\CI_Controller;
use Kenjis\CI3Compatible\Library\CI_Form_validation;

/**
 * @property News_model $news_model
 * @property CI_Form_validation $form_validation
 */
class News extends CI_Controller
{
 public function __construct()
 {
 parent::__construct();
 $this->load->model('news_model');
 $this->load->helper('url_helper');
 }

 public function index()
 {
 $data['news'] = $this->news_model->get_news();
 $data['title'] = 'News archive';

 $this->load->view('templates/header', $data);
 $this->load->view('news/index', $data);
 $this->load->view('templates/footer');
 }

 public function view($slug = null)
 {
 $data['news_item'] = $this->news_model->get_news($slug);

 if (empty($data['news_item'])) {
 show_404();
 }

 $data['title'] = $data['news_item']['title'];

 $this->load->view('templates/header', $data);
 $this->load->view('news/view', $data);
 $this->load->view('templates/footer');
 }

 public function create()
 {
 $this->load->helper('form');
 $this->load->library('form_validation');

 $data['title'] = 'Create a news item';

 $this->form_validation->set_rules('title', 'Title', 'required');
 $this->form_validation->set_rules('text', 'Text', 'required');

 if ($this->form_validation->run() === false) {
 $this->load->view('templates/header', $data);
 $this->load->view('news/create');
 $this->load->view('templates/footer');
 } else {
 $this->news_model->set_news();
 $this->load->view('news/success');
 }
 }
}

app/Models/News_model.php

<?php
namespace App\Models;

use Kenjis\CI3Compatible\Core\CI_Model;

class News_model extends CI_Model
{
 public function __construct()
 {
 parent::__construct();

 $this->load->database();
 }

 public function get_news($slug = false)
 {
 if ($slug === false) {
 $query = $this->db->get('news');
 return $query->result_array();
 }

 $query = $this->db->get_where('news', ['slug' => $slug]);
 return $query->row_array();
 }

 public function set_news()
 {
 $this->load->helper('url');

 $slug = url_title($this->input->post('title'), '-', true);

 $data = [
 'title' => $this->input->post('title'),
 'slug' => $slug,
 'text' => $this->input->post('text')
 ];

 return $this->db->insert('news', $data);
 }
}

app/Views/news/create.php

<h2><?php echo $title; ?></h2>

<?php echo validation_errors(); ?>

<?php echo form_open('news/create'); ?>

 <label for="title">Title</label>
 <input type="input" name="title" /><br />

 <label for="text">Text</label>
 <textarea name="text"></textarea><br />

 <input type="submit" name="submit" value="Create news item" />

</form>

How to Upgrade from CI3 to CI4

See How to Upgrade from CI3 to CI4.

If you have test code with ci-phpunit-test, see How to Upgrade Test Code from CI3 to CI4.

For Development

Installation

composer install

Available Commands

composer test // Run unit test
composer tests // Test and quality checks
composer cs-fix // Fix the coding style
composer sa // Run static analysys tools
composer run-script --list // List all commands