perl 打印数据结构

[perl]代码库

#-----------------------------
DB<1> $reference = [ { "foo" => "bar" }, 3, sub { print "hello, world\n" } ];
DB<2> x $reference
0  ARRAY ( 0x1d033c )

0  HASH ( 0x7b390 )

'foo' = 'bar'>

        1  3

        2  CODE ( 0x21e3e4 )

        - & in ???>
#-----------------------------
        use Data::Dumper;
print Dumper ( $reference );
#-----------------------------
D<1> x \@INC
0  ARRAY ( 0x807d0a8 )

0  '/home/tchrist/perllib'

1  '/usr/lib/perl5/i686-linux/5.00403'

2  '/usr/lib/perl5'

3  '/usr/lib/perl5/site_perl/i686-linux'

4  '/usr/lib/perl5/site_perl'

5  '.'
#-----------------------------
{ package main; require "dumpvar.pl" }
*dumpvar = \&main::dumpvar if __PACKAGE__ ne 'main';
dumpvar ( "main", "INC" );
# show both @INC and %INC
#-----------------------------
@INC = (

           0  '/home/tchrist/perllib/i686-linux'

           1  '/home/tchrist/perllib'

           2  '/usr/lib/perl5/i686-linux/5.00404'

           3  '/usr/lib/perl5'

           4  '/usr/lib/perl5/site_perl/i686-linux'

           5  '/usr/lib/perl5/site_perl'

           6  '.'

       )

       %INC = (

                  'dumpvar.pl' = '/usr/lib/perl5/i686-linux/5.00404/dumpvar.pl'

                                 'strict.pm' = '/usr/lib/perl5/i686-linux/5.00404/strict.pm'

              )
#-----------------------------
              use Data::Dumper;
print Dumper ( \@INC );
$VAR1 = [

            '/home/tchrist/perllib',

            '/usr/lib/perl5/i686-linux/5.00403',

            '/usr/lib/perl5',

            '/usr/lib/perl5/site_perl/i686-linux',

            '/usr/lib/perl5/site_perl',

            '.'

        ];
#-----------------------------