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.IX Title "vars 3perl"
.TH vars 3perl "2021-09-24" "perl v5.32.1" "Perl Programmers Reference Guide"
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.SH "NAME"
vars \- Perl pragma to predeclare global variable names
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use vars qw($frob @mung %seen);
.Ve
.SH "DESCRIPTION"
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\&\s-1NOTE:\s0 For use with variables in the current package for a single scope, the
functionality provided by this pragma has been superseded by \f(CW\*(C`our\*(C'\fR
declarations, available in Perl v5.6.0 or later, and use of this pragma is
discouraged.  See \*(L"our\*(R" in perlfunc.
.PP
This pragma will predeclare all the variables whose names are
in the list, allowing you to use them under \f(CW\*(C`use strict\*(C'\fR, and
disabling any typo warnings for them.
.PP
Unlike pragmas that affect the \f(CW$^H\fR hints variable, the \f(CW\*(C`use vars\*(C'\fR and
\&\f(CW\*(C`use subs\*(C'\fR 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 \f(CW\*(C`no vars\*(C'\fR or \f(CW\*(C`no subs\*(C'\fR.
.PP
Packages such as the \fBAutoLoader\fR and \fBSelfLoader\fR that delay
loading of subroutines within packages can create problems with
package lexicals defined using \f(CW\*(C`my()\*(C'\fR. While the \fBvars\fR 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.
.PP
See \*(L"Pragmatic Modules\*(R" in perlmodlib.