15 Pa.C.S. § 1505: Persons bound by bylaws.

Except as otherwise provided by section 1713 (relating to personal liability of directors) or any similar provision of law, the bylaws of a business corporation are binding on the shareholders, directors and officers of the corporation with respect to its internal affairs whether or not a shareholder, director or officer has actual knowledge of the provisions of the bylaws, but a bylaw shall not affect contracts or other dealings with other persons unless those persons have actual knowledge of the bylaw.