$plugins->{'db_select'} = sub { ... the code here ... };


##</code><code>##


 my $plugins = {

       db_select => sub { ... your code here ... },
     some_other => sub { ... your code here ... }
  
   };


##</code><code>##


use Image::Resize;

my $plugins = {

     image_resize => sub {  ... interface code here ... }

   };