<?php
  
  /*
   * This file is part of the Symfony package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Symfony\Component\Console\Helper;
  
  /**
   * Helper is the base class for all helper classes.
   *
   * @author Fabien Potencier <fabien@symfony.com>
   */
  abstract class Helper implements HelperInterface
  {
      protected $helperSet = null;
  
      /**
       * Sets the helper set associated with this helper.
       *
       * @param HelperSet $helperSet A HelperSet instance
       */
      public function setHelperSet(HelperSet $helperSet = null)
      {
          $this->helperSet = $helperSet;
      }
  
      /**
       * Gets the helper set associated with this helper.
       *
       * @return HelperSet A HelperSet instance
       */
      public function getHelperSet()
      {
          return $this->helperSet;
      }
  
      /**
       * Returns the length of a string, using mb_strlen if it is available.
       *
       * @param string $string The string to check its length
       *
       * @return integer The length of the string
       */
      protected function strlen($string)
      {
          if (!function_exists('mb_strlen')) {
              return strlen($string);
          }
  
          if (false === $encoding = mb_detect_encoding($string)) {
              return strlen($string);
          }
  
          return mb_strlen($string, $encoding);
      }
  }