I'm not sure what you mean when you say you want to group the arrays together. Are you adding a new hash entry, pushing them on an array somewhere?

Since I don't understand your grouping, I'll just tackle the other part of your question. One way to compare arrays would be to create a "stringify" function:

# note that having a sub for this is overkill, but if you 
# need more functionality, it's easy to encapsulate here (such
# as making it case-insensitive to independant of order)

sub stringify { local $" = ""; return "@{$_[0]}" }

if (stringify([sort @array1]) eq stringify([sort @array2])) {
    # arrays are the same
}

[download]

At that point, to find all keys that have identical values:

my %matches;
while (my ($key,$value) = each %somehash) {
    # stringified arrays as keys
    push @{$matches{stringify([sort @$value])}} => $key;
}

[download]

The above code snippet probably doesn't do what you want, but it might give you a starting point. Each stringified array will now point to a list of keys that match it.

Cheers,
Ovid

New address of my CGI Course.
Silence is Evil (feel free to copy and distribute widely - note copyright text)

In reply to Re: How to compare hash value by Ovid
in thread How to compare hash value by Anonymous Monk

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