returning a value from a hash using a reference

[wana]

I know I must be doing something stupid here. I want to return a
value out of a hash using a reference. To be specific:
$session{_session_id} is the hash value I need to get at. Just to
make things interesting, I named my scalar which refers to %session
with the same name: $session = \%session

I know I could use -> notation, but I thought this would work:

$%$session{_session_id}

or

$$session{_session_id}

or some other variation using appropriate parentheses.

Is it possible to dereference this reference in this way to get at the
value?

 

[Gunnar Hjalmarsson]

I know I must be doing something stupid here. I want to return a
value out of a hash using a reference. To be specific:
$session{_session_id} is the hash value I need to get at. Just to
make things interesting, I named my scalar which refers to %session
with the same name: $session = \%session

I know I could use -> notation, but I thought this would work:

$%$session{_session_id}

or

$$session{_session_id}

or some other variation using appropriate parentheses.

my %session = (session_id => 123);
my $session = \%session;

# Accessing the hash value directly:
print $session{session_id}, "\n";

# Dereferencing the hash reference:
print ${$session}{session_id}, "\n";
# or
print $session->{session_id}, "\n";