The php directive register_globals = on is what 
creates $HTTP_USER_AGENT and all vars from various 
places, such as GET, POST, COOKIE, SERVER, etc.

If register_globals = off, $HTTP_USER_AGENT won't 
automagically exist.  See this faqt for related 
information:

  http://www.faqts.com/knowledge_base/view.phtml/aid/31

Regards,
Philip Olson


On Thu, 13 Jun 2002, Webmaster do Aborla.net wrote:

> Hello,
> 
> Why $HTTP_USER_AGENT don't work?? I can't get it's value, but in phpinfo the
> value appears. why this???
> 
> 
> Thanking in advance,
> Nuno Lopes
> 
> 
> 
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