evolution-cms / evolution

        return strtoupper($str);

    }

    public function ucfirst($str)

    {

        if (function_exists('mb_strtoupper')) {

            return mb_strtoupper($this->substr($str, 0, 1)) . $this->substr($str, 1, $this->strlen($str));

        }

        return ucfirst($str);

    }

    public function lcfirst($str)

    {

        return ucfirst($str);

    }

    public function lcfirst($str)

    {

        if (function_exists('mb_strtolower')) {

            return mb_strtolower($this->substr($str, 0, 1)) . $this->substr($str, 1, $this->strlen($str));

        }

        return lcfirst($str);

    }

    public function ucwords($str)

    {