I've tried changing the name of the array but does'nt work.I just ca'nt understand why updating this array will affect another array of a different name

Because a name don't mean much when you're modifying references. Example 

my @foo = 1 .. 4;
my @bar;
my $someReference = \@foo;
$bar[0] = $someReference;
$bar[1] = \@foo;
$bar[2] = $foo[2];

use Data::Dumper;

print Dumper( \@bar ),"\n";

$bar[0][0]='change';
$bar[2] .= ' foo ';

print " bar[0][0] ", $bar[0][0], "\n";
print " bar[1][0] ", $bar[1][0], "\n";

print Dumper( \@bar ),"\n";

__END__

$VAR1 = [
          [
            1,
            2,
            3,
            4
          ],
          $VAR1->[0],
          3
        ];

 bar[0][0] change
 bar[1][0] change
$VAR1 = [
          [
            'change',
            2,
            3,
            4
          ],
          $VAR1->[0],
          '3 foo '
        ];

[download]
Make a change to $bar[0][0], and you're also changing $bar[1][0] because they are one and the same. It doesn't matter if you rename @bar to @barbar if you still asing $bar[0] and $bar[1] the same reference.

See perldata,perlref,perldsc... and perlmonks own Tutorials

In reply to Re: Updating 1 array affects the other array by Anonymous Monk
in thread Updating 1 array affects the other array by iphony

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