Either:
  1. initialize $b as many have said above, or
  2. if you know and don't care that the variable may be uninitialized, add no warnings 'uninitialized'; in the smallest possible scope.
I will usually use the 'no warnings' pragma when looping through a DBI recordset, rather than try to initialize each variable prior to its use.

In reply to Re: Warnings: by jsprat
in thread Uninitialized value in string warnings (was: Warnings:) by Anonymous Monk

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