saving outside website content via php...

I'm using the google api to allow people to search the web via my site. The pages are simply iframed within my site. Is it possible for me to give them a 'save' button and let them save the page they are viewing in it's current state? I don't mean save to their computer but I would use php to save it to disk or the db. How can I do this and pull in all the css, images, etc? Thanks!