I prefer passing the $q query object in its entirety for a few reasons. In particular, it is always handy to be able to get "other" information from it without having to pass this extra stuff explicitly. For example, if you had one function that not only needed the parameters but the REMOTE_HOST info, you would have to extract this and pass it explicitly.

Better to just toss the $q variable into the function and extract params like you would.

Don't forget, though, that since you are extracting the parameters directly from the CGI object, they are tainted until decontaminated by your program. This decontamination can be done by a simple module which is used throughout your program, or by sub-classing CGI to build in this functionality. Consider: 
# Regular CGI
my $quantity = $q->param('quantity');            # Tainted

# "Fancy" CGI of your own construction
my $quantity = $q->SafeNumberParam('quantity');  # De-tainted

[download]
Where your SafeNumberParam function might look like: 
sub SafeNumberParam
{
    my ($self)  = shift;
    my ($param) = @_;

    my ($number) = $self->param($param) =~ /^(\d+)/;

    return $number;
}

[download]

In reply to Re: CGI OO 'param' vs. hash by tadman
in thread CGI OO 'param' vs. hash by legLess

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