How do I get PHP's User-Agent?

From: Date: Wed, 11 Jul 2001 23:03:54 +0000
Subject: How do I get PHP's User-Agent?
Groups: php.general 
Request: Send a blank email to php-general+get-57506@lists.php.net to get a copy of this message
I need to create an authentication hash based on the user agent, to connect to a server but I need PHP’s User Agent, which is usually something like PHP/4.0.X. Is there a variable or way to get this? Thank you.

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