a.php

<?php
if ( ! class_exists('A') ) {

  /**
  * A
  * A minimal PHP router based on file naming, for those times you want to keep things simple.
  * Just name a file like_this.php and you'll get a route http://example.com/like/this.
  *
  * @author   Carles Jove i Buxeda
  * @version  0.6
  * @link     http://github.com/carlesjove/a
  * @license  MIT License (http://www.opensource.org/licenses/mit-license.php)
  */
  class A
  {
    public $path;
    public $layout = 'layout';
    protected $request = '404';
    public $current_lang;

    public function __construct($path)
    {
      $this->path = $this->ignore_ending_slash( explode('/', $path) );
      $this->layout = $this->as_file($this->layout);
    }

    public function dispatch() {
      try {
        $this->find_matches();

        // Include custom functions
        if ( file_exists( $this->as_file('functions') ) ) {
          include $this->as_file('functions');
        }

        if ( $this->uses_layout() ) {
          include $this->global_data();
          if ( $this->is_multilingual() and $this->current_lang ) {
            include $this->global_data($this->current_lang);
          }
          include $this->layout;
        } else {
          $this->content();
        }
      } catch (Exception $e) {
        echo $e->getMessage();
      }
    }

    protected function find_matches() {
      // Is multilingual ?
      if ( ! empty($this->path[0]) ) {
        if ( $this->is_multilingual() and $this->language_exists($this->path[0]) ) {
          $this->current_lang = array_shift($this->path);
        }
      }

      if ( ! empty($this->path[0]) ) {
        if ( $this->is_item_page() ) {
          $file = $this->path[0] . '_' . '[id]';
        } else {
          $file = implode('_', $this->path);
        }
      } else {
        $file = 'home';
      }

      // Not found
      if ( ! file_exists($this->as_file($file)) ) {
        $file = $this->request;
      }

      if ( file_exists( $this->as_file($file) ) ) {
        $this->request = $this->as_file($file);
      } else { // Not even 404 was found, so raise and Exception
        throw new Exception( "Could not find any file matching " . implode('_', $this->path) );
      }
    }

    protected function is_item_page() {
      return isset( $this->path[1] ) and file_exists( $this->as_file($this->path[0] . '_' . '[id]') );
    }

    protected function as_file($string) {
      return $string . '.php';
    }

    protected function uses_layout() {
      if ( file_exists($this->layout) ) {
        return true;
      }
      return false;
    }

    protected function content() {

      $data_directories = array('data/');

      // Include global data
      include $this->global_data();

      // It's multilingual
      if ( $this->is_multilingual() and $this->current_lang ) {
        // Include global data for the current language
        include $this->global_data($this->current_lang);
        // Iclude page content for the current language
        array_push($data_directories, "data/langs/{$this->current_lang}/");
      }

      foreach ( $data_directories as $data ) {
        if ( file_exists($data . $this->request) ) {
          include $data . $this->request;
        }
        if ( $this->is_item_page() and file_exists($this->as_file( $data . $this->path[0])) ) {
          include $this->as_file( $data . $this->path[0] );
          if ( isset($list) and isset($list[$this->path[1]]) ) {
            $item = $list[$this->path[1]];
          }
        }
      }

      include $this->request;
    }

    protected function global_data($lang = '') {
      if ( $lang != '' and file_exists( "data/langs/{$lang}/" . $this->as_file('global') ) ) {
        return "data/langs/{$lang}/" . $this->as_file('global');
      } else {
        if ( file_exists('data/' . $this->as_file('global')) ) {
          return 'data/' . $this->as_file('global');
        }
      }
    }

    protected function is_multilingual() {
      if ( is_dir( 'data/langs' ) ) {
        return true;
      }
      return false;
    }

    protected function language_exists($lang) {
      if ( is_dir( "data/langs/{$lang}" ) ) {
        return true;
      }
      return false;
    }

    protected function ignore_ending_slash($array) {
      $last = count($array) - 1;
      if ( empty( $array[$last] ) ) {
        unset($array[$last]);
      }
      return $array;
    }

    public static function generate_htaccess() {
      $htaccess = "<IfModule mod_rewrite.c> \n"
               . "RewriteEngine On \n"
               . "RewriteCond %{REQUEST_FILENAME} !-d \n"
               . "RewriteCond %{REQUEST_FILENAME} !-f \n"
               . "RewriteRule ^(.*)$ index.php?path=$1 [QSA,L] \n"
               . "</IfModule>";
      file_put_contents('.htaccess', $htaccess );
    }

    /**
     Helper methods
     */

    /**
     * Nav
     * Returns an absolute URL for the $item, which will
     * contain the language if it's multilingual site
     *
     * In your layout.php you would use is like this:
     * <a href="<?php echo $this->nav('my-page'); ?>">My Page</a>
     * This will return /my-page or /[lang]/my-page
     */
    public function nav($item) {
      $output = $item;
      if ( $this->current_lang ) {
        $output = $this->current_lang . '/' . $item;
      }
      return '/' . $output;
    }

    /**
     * Lang
     * Returns the current page link for the requested language
     *
     * In your layout.php you would use is like this:
     * <a href="<?php echo $this->lang('ca'); ?>">Català</a>
     * This will return /ca/[current-page]
     */
    public function lang($lang) {
      return '/' . $lang . '/' . implode('/', $this->path);
    }

    /**
     * Stylesheet
     * Returns a stylesheet link
     *
     * In your layout.php you would use is like this:
     * <?php echo $this->stylesheet('app'); ?>
     */
    public function stylesheet($name) {
      return "<link rel='stylesheet' type='text/css' href='/assets/css/{$name}.css' />";
    }
  }

}