.htaccess / PHP / setenvif

Is there anyway I can use the setenvif command in .htaccess to identify a site-sucker bot and use php to address it?

like in .htaccess:

setenvif rule SOMETHING=Sucker

then in php:

$id=$HTTP_SERVER_VARS["SOMETHING"];

if ($id=="Sucker".....

Thanks guys, First Post!

I guess my MODIFIED, more clear question should be (and it is more apache than php):

Is there any way I can use rules in an htaccess file to set an environment variable that I can read via php with $HTTP_SERVER_VARS ?

I.e. based on browser, set the AUTH_USER to something I define like "Builder" and get it in php via $HTTP_SERVER_VARS["AUTH_USER"]

Why not implement whatever rule you want directly in PHP?

Alternatively, if you want to ban a robot, why not just get apache to deny access based on this rule? Then the PHP won't even need to be executed.

Something like

 SetEnvIf User-Agent nastybot go_away

Order Allow, deny
Allow from all
Deny from env=go_away

Mark