docs: |
    The L<Digest::MD5> module provides sufficient support.

        use Digest::MD5;

        sub md5_file
        {
            my $filename = shift;
            my $ctx = Digest::MD5->new;
            open my $fh, '<', $filename or die $!;
            binmode( $fh );
            $ctx->addfile( $fh )->digest; # or hexdigest, or b64digest
        }

    Despite providing that possible implementation just above, I've chosen to
    not include it as an export due to the amount of flexibility of
    L<Digest::MD5> and the number of ways you may want to get your file
    handle. After all, you may want to use L<Digest::SHA1>, or
    L<Digest::MD4> or some other digest mechanism.

    Again, I wonder why PHP has the function as they so arbitrarily
    hobble it.