1vars(3pm) Perl Programmers Reference Guide vars(3pm)
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6 vars - Perl pragma to predeclare global variable names (obsolete)
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9 use vars qw($frob @mung %seen);
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12 NOTE: For variables in the current package, the functionality provided
13 by this pragma has been superseded by "our" declarations, available in
14 Perl v5.6.0 or later. See "our" in perlfunc.
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16 This will predeclare all the variables whose names are in the list,
17 allowing you to use them under "use strict", and disabling any typo
18 warnings.
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20 Unlike pragmas that affect the $^H hints variable, the "use vars" and
21 "use subs" declarations are not BLOCK-scoped. They are thus effective
22 for the entire file in which they appear. You may not rescind such
23 declarations with "no vars" or "no subs".
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25 Packages such as the AutoLoader and SelfLoader that delay loading of
26 subroutines within packages can create problems with package lexicals
27 defined using "my()". While the vars pragma cannot duplicate the effect
28 of package lexicals (total transparency outside of the package), it can
29 act as an acceptable substitute by pre-declaring global symbols,
30 ensuring their availability to the later-loaded routines.
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32 See "Pragmatic Modules" in perlmodlib.
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36perl v5.10.1 2009-02-12 vars(3pm)