Hello,

The reason you are getting that error is just like the error says.
you are trying to use the string 'value' as a hash reference.

print "'hash{key}' is a hash reference\n" if ref(\%{$hash{key}}) eq 'H
+ASH';

[download]
$hash{key} = 'value'

and you are trying to reference it as a hash by surrounding it with '\%{ }
In Essense you are saying '\%{"value"}'

I'm not really sure what you are doing with this, but you could use some sort of
recursive subroutine to dig down into the hash to get what you want.

Something like this maybe.

#!/usr/local/bin/perl5.6.0
use strict;
use warnings;

my $hash =
{
    h1  => { ss1 => 'Howdy' },
    h2  =>
    {
        hh1 => { sss1    => 'Hello' }
    },
    s1 => 'Doody',
    a1  => [],
};

dig( $hash );

sub dig
{
    my ( $hole ) = @_;

    if( ref($hole) eq 'HASH' )
    {
        foreach my $l ( keys %{$_[0]} )
        {
            dig( $_[0]->{$l} );
        }
    }
    elsif ( ref($hole) eq 'ARRAY' )
    {
        print q{What do I do with an Array ref?\n};
    }
    else
    {
        my $leaf = $hole; # leaf in a hole?!?

        print qq{Found a leaf in an hole! [$leaf]\n};
    }
}

[download]

In reply to Re: hash reference syntax? by Wonko the sane
in thread hash reference syntax? by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.