MAN page from RedHat Other perl-5.004-0.1.i386.rpm

vars

Section: Perl Programmers Reference Guide (3)
Updated: perl 5.004, patch 04
Index

NAME

vars - Perl pragma to predeclare global variable names

SYNOPSIS

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

DESCRIPTION

This will predeclare all the variables whose names are in the list, allowing you to use them under ``use strict'', anddisabling any typo warnings.

Unlike pragmas that affect the $^H hints variable, the use vars anduse subs declarations are not BLOCK-scoped. They are thus effectivefor the entire file in which they appear. You may not rescind suchdeclarations with no vars or no subs.

Packages such as the AutoLoader and SelfLoader that delayloading of subroutines within packages can create problems withpackage lexicals defined using my(). While the vars pragmacannot duplicate the effect of package lexicals (total transparencyoutside of the package), it can act as an acceptable substitute bypre-declaring global symbols, ensuring their availability to thelater-loaded routines.

See the section on Pragmatic Modules in the perlmod manpage.

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