Codeigniter

for remove "index.php" from address bar:

Create .htacess in root folder, above application folder and type:
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

You must type in bash to activate rewrite module:
sudo a2enmod rewrite

application/config/config.php:

$config['base_url'] = '';
or $config['base_url'] = $_SERVER['HTTP_HOST'].'/';

$config['index_page'] = 'index.php';
$config['log_threshold'] = 0; - уровень ошибок, записываемых в лог.

файл application/config/database.php - add to .gitignore

Rename application and system folders, then change settings in the index.php in the root of project

Start project:

 создаем шаблоны header.php и footer.php в views/templates
 создаем страницу {page}.php в views/pages
 создаем контроллер Page.php в controllers и помещаем в него:
<?php
 class Page extends CI_Controller {
  public function view($page = 'page')
  {
    if ( ! file_exists(APPPATH.'/views/pages/'.$page.'.php'))
    {
        show_404();
    }
    $data['title'] = "My title ...";
    $this->load->view('templates/header', $data);
    $this->load->view('pages/'.$page, $data);
    $this->load->view('templates/footer', $data);
  }
 }

Доступ к странице: {host_name}/index.php/{class_name}/{method_name}

apache2.conf:
<Directory /{host_path}>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>

Маршрутизация:

config/routes.php:
$route['default_controller'] = 'page/view'; //{class_name}/{method_name}; - главная страница
$route['{url}'] = '{class_name}/{method_name}';