title: Open Source Ad/Banner System in PHP?
body: <p>My client needs to have a banner management system installed to their site.
  They want the system to be able to manage banners based on time (i.e. a client purchases an ad for 3 months, the site needs to not display that ad after 3 months time even if we don't change any settings)
  It also needs to integrate into our website.  We have the client information already saved to our database, we want an ad system that can link up with our existing client database if possible.
  Are there any php solutions available like this?</p>