NAME

       Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles - Write "open my $fh, q{<},
       $filename;" instead of "open FH, q{<}, $filename;".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Using bareword symbols to refer to file handles is particularly evil because they are
       global, and you have no idea if that symbol already points to some other file handle.  You
       can mitigate some of that risk by "local"izing the symbol first, but that's pretty ugly.
       Since Perl 5.6, you can use an undefined scalar variable as a lexical reference to an
       anonymous filehandle.  Alternatively, see the IO::Handle or IO::File or FileHandle modules
       for an object-oriented approach.

           open FH, '<', $some_file;           #not ok
           open my $fh, '<', $some_file;       #ok
           my $fh = IO::File->new($some_file); #ok

       There are three exceptions: STDIN, STDOUT and STDERR.  These three standard filehandles
       are always package variables.

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       IO::Handle

       IO::File

AUTHOR

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

perl v5.24.1                  Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3pm)