LJ::load_user_props — Given a user hashref, loads the values of the given named properties into that user hashref.
LJ::load_user_props(u, opts, propname
u. A hashref of a row from the user table, sometimes called a "user object". Although only initially a row from the user table, gets a lot of tacked onto it from various other LJ API functions.
opts. hashref of opts. set key 'cache' to use memcache.
propname. the name of a property from the userproplist table.