vars - Perl pragma to predeclare global variable names (obsolete)
use vars qw($frob @mung %seen);
NOTE: For variables in the current package, the functionality provided
by this pragma has been superseded by our declarations, available
in Perl v5.6.0 or later. See perlfunc/our.
This will predeclare all the variables whose names are in the list, allowing you to use them under "use strict", and disabling any typo warnings.
Unlike pragmas that affect the $^H hints variable, the use vars and
use subs declarations are not BLOCK-scoped. They are thus effective
for the entire file in which they appear. You may not rescind such
declarations with no vars or no subs.
Packages such as the AutoLoader and SelfLoader that delay
loading of subroutines within packages can create problems with
package lexicals defined using my(). While the vars pragma
cannot duplicate the effect of package lexicals (total transparency
outside of the package), it can act as an acceptable substitute by
pre-declaring global symbols, ensuring their availability to the
later-loaded routines.