You could try using the & form of a subroutine call: 
for (keys %online_users) {
 if (policy_is_expired($_)) {
  &logoff_user;
 }
}

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This form passes @_ to the sub if no arguments are given.

In reply to Re: passing $_ to my function by robartes
in thread passing $_ to my function by arc_of_descent

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