Thinking about 'our' vs 'use vars' made me wonder: Why are you using a var in the first place? 
package ConfigThisJunk;
use strict;
use warnings;
use Exporter;
our @ISA = qw( Exporter );
our @EXPORT_OK = qw( DEBUG );

use constant DEBUG => 1;

1;

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use strict;
use warnings;
use ConfigThisJunk qw( DEBUG );

my $x = 123;
print("debug: x is $x\n") if DEBUG;

[download]

Bonus: If DEBUG is false, the whole print-if is optimised away because it's a constant! (If it's true, the if part is optimised away.)

If you wanted the be able to change DEBUG, this is still cleaner: 

package ConfigThisJunk;
use strict;
use warnings;
use Exporter;
our @ISA = qw( Exporter );
our @EXPORT_OK = qw( DEBUG );

my $DEBUG = 1;

sub DEBUG {
   if (@_) { $DEBUG = shift; }
   return $DEBUG;
}

1;

[download]
use strict;
use warnings;
use ConfigThisJunk qw( DEBUG );

my $x = 123;
print("debug: x is $x\n") if DEBUG;

[download]

In reply to Re: Global variables in Perl by ikegami
in thread Global variables in Perl by taioba

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