On Tuesday 27 April 2010 10:18:17 Michael Ludwig wrote:
> A lexical variable in Perl is any variable declared with "my", regardless
> of the scope, which may be file-level. Unlike globals, lexical variables
> aren't directly accessible from outside the package.
Not quite correct. Consider this:
$ perl -Mstrict -le '
my $x=10;
our $y=20;
{
package hugo;
print "x=$x"; # references $x outside of package hugo
print "y=$y"; # references $main::y
($x,$y)=(1,2);
}
print "x=$x";
print "y=$y"
'
x=10
y=20
x=1
y=2
$x is file-level lexical. It is visible all over the file. The embedded
package hugo has no influence. Lexical variables are not bound to a package
but to a lexical scope.
Same with our-variables. C<our> declares the visibility of a variable in the
current lexical scope.
> You can read up about this issue here:
>
> http://perl.apache.org/docs/general/perl_reference/perl_reference.html
Or for German speakers, there was a series of articles about scoping in $foo-
magazin:
http://foo-magazin.de/
Torsten Förtsch
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