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vars(3perl) Perl Programmers Reference Guide vars(3perl)
NAME
vars - Perl pragma to predeclare global variable names
SYNOPSIS
use vars qw($frob @mung %seen);
DESCRIPTION
NOTE: For use with variables in the current package for a single scope, the functionality
provided by this pragma has been superseded by "our" declarations, available in Perl
v5.6.0 or later, and use of this pragma is discouraged. See "our" in perlfunc.
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.
See "Pragmatic Modules" in perlmodlib.
perl v5.20.2 2014-12-27 vars(3perl)
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