Is it standard to check for proxies with getenv and is it effective?

Posted by Scarface on Stack Overflow See other posts from Stack Overflow or by Scarface
Published on 2010-04-29T03:10:26Z Indexed on 2010/04/29 3:17 UTC
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Hey quick question, I am wondering

  1. Do big sites use php's getenv function to prevent proxy users from registering or signing in?
  2. Is it effective in deterring hackers from creating a bunch of accounts for abusive purposes if it is used?

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