How to poll the popular websites in PHP?

Posted by Runner on Stack Overflow See other posts from Stack Overflow or by Runner
Published on 2010-04-11T08:13:28Z Indexed on 2010/04/11 8:23 UTC
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polling

It's springed from this answer:

http://superuser.com/questions/129741/how-does-search-engines-update-indexing-so-soon/129743#129743

BTW,for the servers that's polled,is it the same whether the request is just for polling(header information) or complete web page?

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