vars(3p) Perl Programmers Reference Guide vars(3p) #

vars(3p) Perl Programmers Reference Guide vars(3p)

NNAAMMEE #

 vars - Perl pragma to predeclare global variable names

SSYYNNOOPPSSIISS #

     use vars qw($frob @mung %seen);

DDEESSCCRRIIPPTTIIOONN #

 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 the functionality provided by this pragma has been superseded by "our"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 AAuuttooLLooaaddeerr and SSeellffLLooaaddeerr that delay loading of
 subroutines within packages can create problems with package lexicals
 defined using "my()". While the vvaarrss 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 v5.36.3 2019-12-30 vars(3p)