Another way to prove that, what you see inside the sub through @_ is the same variables you see outside the sub: 

use strict;
use warnings;

my $a;
print \$a, "\n";
somesub($a);

sub somesub {
    print \$_[0];
}

[download]

This gives:

SCALAR(0x182419c)
SCALAR(0x182419c)

[download]

In reply to Re: lhs substr(): refs vs. scalars by pg
in thread lhs substr(): refs vs. scalars by renodino

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