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functionality provided by this pragma has been superseded by "our"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 will predeclare all the variables whose names are in the list, allowing you
to use them under "use strict", and disabling any typo warnings.
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.