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.IX Title "PerlIO::encoding 3"
.TH PerlIO::encoding 3 2024-05-07 "perl v5.42.0" "Perl Programmers Reference Guide"
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.SH NAME
PerlIO::encoding \- encoding layer
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  use PerlIO::encoding;
\&
\&  open($f, "<:encoding(foo)", "infoo");
\&  open($f, ">:encoding(bar)", "outbar");
\&
\&  use Encode qw(:fallbacks);
\&  $PerlIO::encoding::fallback = FB_PERLQQ;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This PerlIO layer opens a filehandle with a transparent encoding filter.
.PP
On input, it converts the bytes expected to be in the specified
character set and encoding to Perl string data (Unicode and
Perl\*(Aqs internal Unicode encoding, UTF\-8).  On output, it converts
Perl string data into the specified character set and encoding.
.PP
When the layer is pushed, the current value of \f(CW$PerlIO::encoding::fallback\fR
is saved and used as the CHECK argument when calling the Encode methods
\&\fBencode()\fR and \fBdecode()\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
open, Encode, "binmode" in perlfunc, perluniintro