Array in value of hash perl

Yes it is. Create a reference to the array by using backslash:

$hash{key} = \@array;

Note that this will link to the actual array, so if you perform a change such as:

$array[0] = "foo";

That will also mean that $hash{key}[0] is set to "foo".

If that is not what you want, you may copy the values by using an anonymous array reference [ ... ]:

$hash{key} = [ @array ];

Moreover, you don't have to go through the array in order to do this. You can simply assign directly:

$hash{key} = [ qw(foo bar baz) ];

Read more about making references in perldoc perlref

Yes. See http://perlmonks.org/?node=References+quick+reference for some basic rules for accessing such data structures, but to create it, just do one of these:

%hash = ( 'somekey' => \@arrayvalue );
$hash{'somekey'} = \@arrayvalue;
%hash = ( 'somekey' => [ ... ] );