symfony/src/Symfony/Component/Console/Helper/Helper.php

<?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_strwidth if it is available.
     *
     * @param string $string The string to check its length
     *
     * @return int The length of the string
     */
    protected function strlen($string)
    {
        if (!function_exists('mb_strwidth')) {
            return strlen($string);
        }

        if (false === $encoding = mb_detect_encoding($string)) {
            return strlen($string);
        }

        return mb_strwidth($string, $encoding);
    }
}