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')
);

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In reply to Re: CGI.pm: Can't modify non-lvalue subroutine call by hippo
in thread CGI.pm: Can't modify non-lvalue subroutine call by slugger415

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