PerlIO::scalar - phpMan

PerlIO::scalar(3perl)            Perl Programmers Reference Guide           PerlIO::scalar(3perl)

NAME
       PerlIO::scalar - in-memory IO, scalar IO

SYNOPSIS
          my $scalar = '';
          ...
          open my $fh, "<",  \$scalar or die;
          open my $fh, ">",  \$scalar or die;
          open my $fh, ">>", \$scalar or die;

       or

          my $scalar = '';
          ...
          open my $fh, "<:scalar",  \$scalar or die;
          open my $fh, ">:scalar",  \$scalar or die;
          open my $fh, ">>:scalar", \$scalar or die;

DESCRIPTION
       A filehandle is opened but the file operations are performed "in-memory" on a scalar
       variable.  All the normal file operations can be performed on the handle. The scalar is
       considered a stream of bytes.  Currently fileno($fh) returns -1.

       Attempting to open a read-only scalar for writing will fail, and if warnings are enabled,
       produce a warning.

IMPLEMENTATION NOTE
       "PerlIO::scalar" only exists to use XSLoader to load C code that provides support for
       treating a scalar as an "in memory" file.  One does not need to explicitly "use
       PerlIO::scalar".

perl v5.34.0                                2025-07-25                      PerlIO::scalar(3perl)

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