After you create the C::A instance, you can always stick it in a global variable:

my $cgi = new CGI::Applicaton(...);
$::global_var = $cgi;
... use $::global_var now anywhere ...
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A variable like $::global_var is a fully-qualified name which is as close as Perl gets to global variables. It is equivalent to $main::global_var or to using our in package main:

...
{
  package main;
  our $global_var; # same as $::global_var and $main::global_var
  ...
}
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You can create a tie interface if you want to access parameters like you did with a hash. See man perltie for more details. However, if you are writing new CGI applications, I wouldn't do this. Just extract parameters into simple variables if you need to use them more than once. A tie interface would allow you to use hash-like syntax for the following operations:

print $hash{'key'}    # same as print $webapp->param('key')
$hash{'key'} = 3;     # same as $webapp->param('key', 3);
[download]

However, I would make sure it is really worth implementing because it will add complexity and degrade your application performance.

If you really need to access the values as a hash, perhaps you can first extract all the CGI parameters to a hash like this:

our %hash;
my @all_params = $webapp->param();
for my $p (@all_params) {
  $hash{$p} = $webapp->param($p); #
}
... use %hash instead of calling $webapp->param(...) ...
[download]

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