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#!/usr/bin/perl -w

use strict;
...

my $f = 'foo';
&$f;

my %ops = (
    one => \&one,
    two => \&two,
...
my $op = $q->param( 'op' );
die "Invalid operation '$op'\n" unless exists $ops{ $op };
$subs{ $op }->();

my $op = $q->param( 'op' );

my $sub = __PACKAGE__->can( $op );
die "Invalid op '$op'\n" unless $sub;

$sub->();