``` ## How to Upgrade from CI3 to CI4 See [How to Upgrade from CI3 to CI4](docs/HowToUpgradeFromCI3ToCI4.md). If you have test code with [ci-phpunit-test](https://github.com/kenjis/ci-phpunit-test), see [How to Upgrade Test Code from CI3 to CI4](docs/HowToUpgradeTestCodeFromCI3ToCI4.md). ## 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

CodeIgniter 3 to 4 Upgrade Helper

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

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
```php

<?php echo $title; ?>

<?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">