vars(3perl) Perl Programmers Reference Guide vars(3perl)
vars - Perl pragma to predeclare global variable names
use vars qw($frob @mung %seen);
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the functionality provided by this pragma has been superseded by "our"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
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 v5.26.1 2020-10-19 vars(3perl)
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