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my %args;
    
...
    } else {
        @args{qw(flags img name big gallery page caption num)} = @_;
    }

$defaults = { flags => 0x8001, img => "/path/file.jpg", ... };
for (qw( flags img name big gallery page caption num ) )  {
    $$_ = $opts->{$_} || $defaults->{$_};
}