Passing an array as an argument.

How do you pass an array as an argument to a function? My code (or at least the important parts): function process_members($asker_rank, $email) { global $database_mysql; mysql_select_db($database_mysql); while (list ($key, $val) = each ($email)) { echo "$key => $val<br>"; } } ######### This will display fine. ######### while (list ($key, $val) = each ($email)) { echo "$key => $val<br>"; } ######### Doing the same thing with the function here returns this error, though. ######## // Warning: Variable passed to each() is not an array or object in lib.inc on line 447 process_members($asker_rank, $total_members, $email);