recursion check: 
sub print_r {
    
    my $level="";
    my @level_index=();
    my @print_r_Recursion=();
    print_rec (@_);
    undef @level_index;
    undef @print_r_Recursion;
    undef $level;
    
    sub print_rec {

        if ( ! defined $level ) { $level = 0 };
        if ( ! defined @level_index ) { $level_index[$level] = 0 };

        for ( @_ ) {

            my $element = $_;
            my $index   = $level_index[$level];
            
            if (ref($element) eq 'ARRAY' || ref($element) eq 'HASH'){
                my $loop=0;
                for (@print_r_Recursion){
                    if (($element."") eq ($_."")){
                        $loop=1;
                        last;
                    }
                }
                if ($loop==1){
                    print "\t" x $level . "[$index] => ". ref($elem
+ent) ." *recursion*\n";
                    next;
                }
                push @print_r_Recursion,$element;
            }
            
            print "\t" x $level . "[$index] => ";

            if ( ref($element) eq 'ARRAY' ) {
                my $array = $_;

                $level_index[++$level] = 0;

                print "(Array)\n";

                for ( @$array ) {
                    print_rec( $_ ); 
                }
                --$level if ( $level > 0 );
            } elsif ( ref($element) eq 'HASH' ) {
                my $hash = $_;

                print "(Hash)\n";

                ++$level;

                for ( keys %$hash ) {
                    $level_index[$level] = $_;
                    print_rec( $$hash{$_} );
                }
            } else {
                print "$element\n";
            }

            $level_index[$level]++;
        }
    }
}

[download]

In reply to Re^3: print_r by Anonymous Monk
in thread print_r by GhodMode

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.