CGI.pm: Can't modify non-lvalue subroutine call

slugger415 has asked for the wisdom of the Perl Monks concerning the following question:

Hello esteemed PerlMonks. I want to assign the value of one variable returned from a CGI.pm script, if it exists, to another, e.g.:

if($q->param('product_key_text')){ # if was entered in the text field,
                                    # set it to product_key
  $q->param('product_key')=$q->param('product_key_text');
 }
[download]

But I'm getting this error when text is entered in product_key_text:

Can't modify non-lvalue subrutine call

I gather I'm trying to modify a param that can't be modified; how do I do this? Thanks!

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Re: CGI.pm: Can't modify non-lvalue subroutine call by hippo (Archbishop) on Mar 22, 2019 at 23:02 UTC
The correct way to set the value of a parameter to that of another is this: `$q->param ( -name => 'product_key', -value => $q->param('product_key_text') );` [download]	[reply] [d/l]
Re^2: CGI.pm: Can't modify non-lvalue subroutine call by slugger415 (Monk) on Mar 22, 2019 at 23:11 UTC
Perfect! thank you for the quick reply.	[reply]