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PerlIO::encoding(3)    Perl Programmers Reference Guide    PerlIO::encoding(3)

       PerlIO::encoding - encoding layer

         open($f, "<:encoding(foo)", "infoo");
         open($f, ">:encoding(bar)", "outbar");

         use Encode qw(:fallbacks);
         $PerlIO::encoding::fallback = FB_PERLQQ;

       Open a filehandle with a transparent encoding filter.

       On input, convert the bytes expected to be in the specified character set and encoding to Perl string data
       (Unicode and Perl's internal Unicode encoding, UTF-8).  On output, convert Perl string data into the specified
       character set and encoding.

       When the layer is pushed the current value of $PerlIO::encoding::fallback is saved and used as the CHECK argu-
       ment when calling the Encode methods encode() and decode().

       open, Encode, "binmode" in perlfunc, perluniintro

perl v5.8.8                       2001-09-21               PerlIO::encoding(3)