# NAME

utf8::all - turn on Unicode - all of it

# VERSION

version 0.017

# SYNOPSIS

    use utf8::all;                      # Turn on UTF-8, all of it.

    open my $in, '<', 'contains-utf8';  # UTF-8 already turned on here
    print length 'føø bār';             # 7 UTF-8 characters
    my $utf8_arg = shift @ARGV;         # @ARGV is UTF-8 too (only for main)

# DESCRIPTION

The `use utf8` pragma tells the Perl parser to allow UTF-8 in the
program text in the current lexical scope. This also means that you
can now use literal Unicode characters as part of strings, variable
names, and regular expressions.

`utf8::all` goes further:

- [`charnames`](https://metacpan.org/pod/charnames) are imported so `\N{...}` sequences can be
used to compile Unicode characters based on names.
- On Perl `v5.11.0` or higher, the `use feature 'unicode_strings'` is
enabled.
- `use feature fc` and `use feature unicode_eval` are enabled on Perl
`5.16.0` and higher.
- Filehandles are opened with UTF-8 encoding turned on by default
(including STDIN, STDOUT, STDERR). Meaning that they automatically
convert UTF-8 octets to characters and vice versa. If you _don't_
want UTF-8 for a particular filehandle, you'll have to set `binmode
$filehandle`.
- `@ARGV` gets converted from UTF-8 octets to Unicode characters (when
`utf8::all` is used from the main package). This is similar to the
behaviour of the `-CA` perl command-line switch (see [perlrun](https://metacpan.org/pod/perlrun)).
- `readdir`, `readlink`, `readpipe` (including the `qx//` and
backtick operators), and [`glob`](https://metacpan.org/pod/perlfunc#glob) (including the `<>` operator) now all work with and return Unicode characters instead
of (UTF-8) octets.

## Lexical scope

The pragma is lexically-scoped, so you can do the following if you had
some reason to:

    {
        use utf8::all;
        open my $out, '>', 'outfile';
        my $utf8_str = 'føø bār';
        print length $utf8_str, "\n"; # 7
        print $out $utf8_str;         # out as utf8
    }
    open my $in, '<', 'outfile';      # in as raw
    my $text = do { local $/; <$in>};
    print length $text, "\n";         # 10, not 7!

Instead of lexical scoping, you can also use `no utf8::all` to turn
off the effects.

Note that the effect on `@ARGV` and the `STDIN`, `STDOUT`, and
`STDERR` file handles is always global!

# SEE ALSO

- [File::Find::utf8](https://metacpan.org/pod/File::Find::utf8) for fully utf-8 aware File::Find functions.
- [Cwd::utf8](https://metacpan.org/pod/Cwd::utf8) for fully utf-8 aware Cwd functions.

# INTERACTION WITH AUTODIE

If you use [autodie](https://metacpan.org/pod/autodie), which is a great idea, you need to use at least version
**2.12**, released on [June 26, 2012](https://metacpan.org/source/PJF/autodie-2.12/Changes#L3).
Otherwise, autodie obliterates the IO layers set by the [open](https://metacpan.org/pod/open) pragma. See
[RT #54777](https://rt.cpan.org/Ticket/Display.html?id=54777) and
[GH #7](https://github.com/doherty/utf8-all/issues/7).

# AVAILABILITY

The project homepage is [http://metacpan.org/release/utf8-all/](http://metacpan.org/release/utf8-all/).

The latest version of this module is available from the Comprehensive Perl
Archive Network (CPAN). Visit [http://www.perl.com/CPAN/](http://www.perl.com/CPAN/) to find a CPAN
site near you, or see [https://metacpan.org/module/utf8::all/](https://metacpan.org/module/utf8::all/).

# SOURCE

The development version is on github at [http://github.com/doherty/utf8-all](http://github.com/doherty/utf8-all)
and may be cloned from [git://github.com/doherty/utf8-all.git](git://github.com/doherty/utf8-all.git)

# BUGS AND LIMITATIONS

You can make new bug reports, and view existing ones, through the
web interface at [https://github.com/doherty/utf8-all/issues](https://github.com/doherty/utf8-all/issues).

# COMPATIBILITY

The filesystems of Dos, Windows, and OS/2 do not (fully) support
UTF-8. The `readlink` and `readdir` functions and `glob` operators
will therefore not be replaced on these systems.

# AUTHORS

- Michael Schwern <mschwern@cpan.org>
- Mike Doherty <doherty@cpan.org>

# COPYRIGHT AND LICENSE

This software is copyright (c) 2009 by Michael Schwern <mschwern@cpan.org>.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.