vars(3pm) Perl Programmers Reference Guide vars(3pm)
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the functionality provided by this pragma has been superseded by "our"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 pragma will predeclare all the variables whose names are in the
list, allowing you to use them under "use strict", and disabling any
typo warnings for them.
Unlike pragmas that affect the $^H hints variable, the "use vars" and
"use subs" declarations are not lexically scoped to the block they
appear in: they affect the entire package in which they appear. It is
not possible to rescind these 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(1).
perl v5.28.1 2018-11-01 vars(3pm)
perl 5.28.1 - Generated Tue Jan 15 07:09:21 CST 2019