multi-threading within php?

Hello! I was making a spider for a simple searchengine and all was well until I started testing it on larger sites. The problem isn't that it doesn't work, it does, but it is very very slow, just handling one connection at the time. Basically, it just downloads a page, extract all links from it, then downloads those pages, extract their links, until all pages on a site has been downloaded and archived. Is there any way to do it in several threads so that it handles several connections simultaneously? If it would dynamically allocate threads that would be even better. Regards, Mattias Andersson Software Developer, humany AB Direct: 08-4540701 Mobile: 0704-526685