How might I obtain a Snapshot or Thumbnail of a web page using PHP?

Question

I need to create Snapshots / Thumbshots / Site preview a-site.com.

There are some site as thumbshot.org that meets with I need. But I do not want to use an external

Answer 1

There's a Firefox extension that converts the webpage you're viewing to an image:

http://www.screengrab.org/

http://addons.mozilla.org/en-US/firefox/addon/1146

If you're willing to get creative, it might be possible to access this problematically.