Why not just subclass CGI?

If you don't want to do that, then I recommend the following: 

# Must appear before "use CGI".
BEGIN {
   require CGI;
   package CGI;
   no warnings 'redefine';
   my $real_param = \&CGI::param;
   sub param {
      if (wantarray) {
         return map { Encode::decode_utf8($_) } $real_param->(@_);
      } else {
         return Encode::decode_utf8($real_param->(@_));
      }
   }
}

[download]

My version fixes two bugs.

Updated to work in list context.

In reply to Re: How to change the symbol table to wrap a sub in another sub ? by ikegami
in thread How to change the symbol table to wrap a sub in another sub ? by Withigo

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