map { $_ => do { local ($/,*F); open F, "<$_" or die 
             "Error reading '$_': $!"; <F> }} glob('*')
       #or
       
       map{$_=>do{open my $fh,$_ or die"$_:$!";<$fh>}}glob('*')
  

##</code><code>##

  package MyPackage; 
      sub make_hash { 
          (local $/)=undef; 
          my (@files,%hash); 
          @files = @_; 
          
          foreach my $file ( @files ) { 
            open( my $fh, $file ) or next; 
            $hash{$file} = <$file>;
           }; 
          return \%hash; 
        }
     __END__

  

##</code><code>##

    foreach $filename (glob('*', '.*')) { 
        open(DF, $filename) or die(); 
        @{$hash{$filename}} = <DF>; 
       close(DF); }
   #the snippet i mentioned would have had the contents in @{$hash{$filename}}, 
   #but you would have had to reassemble that back into a single string, if that is what you needed)