base64-encoding in cookies?

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Hi,

A campus web server (not under my control) returns an authentication
string in a cookie named AUTH.  The cookie's value is an encrypted,
base64 encoded string.  Unfortunately, when I examine $_COOKIE['AUTH'],
it is clear that all of the '+' characters have been replaced with a ' ' 
character in the base64 string.  Why is this?  Obviously, this corrupts
the data and makes it impossible to base64-decode the string correctly.
I believe this is a php issue and not, say, an apache issue because a
perl program can correctly authenticate the same cookie based on perl's
$ENV{'HTTP_COOKIE'}.  i.e., the perl cookie contains the original '+'.
Does anyone know how to make php (v5.1.5) do the right thing with base64
encoded cookies?

Thanks
Fletcher

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