Re: ptkdb: 'my' variable in sub retains value between calls

my $a,$b; doesn't declare $b, only $a. Had you included

use strict;
use warnings;
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at the start of the program (see strict and warnings), perl would have told you "Parentheses missing around "my" list ...". The correct way is my ($a, $b);. But, $a and $b aren't good names to use as they are somewhat magical for their use with sort. You should choose more meaningful names.

Unless I state otherwise, all my code runs with strict and warnings

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Re^2: ptkdb: 'my' variable in sub retains value between calls by leonidlm (Pilgrim) on Aug 10, 2008 at 16:11 UTC
Thank you all. The variable names are just for an example, of course I used a proper names in my program, it is more than 2000 lines, I don't think I would manage elsewhere.	[reply]
Re^3: ptkdb: 'my' variable in sub retains value between calls by GrandFather (Saint) on Aug 10, 2008 at 22:53 UTC
$foo and $bar are good time honored place holder names for variables and are almost as easy to type as $a and $b. Perl reduces RSI - it saves typing	[reply]
Re^3: ptkdb: 'my' variable in sub retains value between calls by Anonymous Monk on Aug 11, 2008 at 02:16 UTC
If, in addition to using `warnings` with its very helpful message referred to in other replies, you had been using `strict`, Perl would never have let you make the mistake in the first place if you were using names other than `$a` and `$b`!	[reply] [d/l] [select]