> I am having trouble with is comparing the username to
> $_SESSION['friends'] which is a list of 1 or more usernames. If there
> is a match I want to set type to 'friend'.
...
>                         //else if (username found in $_SESSION['friends'])

This has nothing to do with maps.

The first underlying question is really "how to pass a string held in
server-side php to the client-side javascript in the created
webpage"
... which you already solved in this line
       if (username == "<?php echo $_SESSION['valid_user']?>")

The second part is "how to search within one string for a target
string" which is a fairly common javascript subject, for example
http://www.tizag.com/javascriptT/javascript-string-search.php

Having got the basics working, you might want to enhance to deal with
cases like null or whitespace strings.

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