sub outputHeader {
  my $reportHandle = $_[0];
  my $reportPath = $_[1];
  my $group = $_[2];
  my $criterion = $_[3];
  my $worksheet = shift;

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Also, it's usually not a good idea to mix my $var = $_[0] and my $var = shift-style handling of arguments (unless you know what you're doing and why...:)

In this case, $worksheet will have the same value as $reportHandle. Not sure if this is intended. If so, it's clearer to directly write my $worksheet = $reporthandle;

In reply to Re^2: isn't numeric in substr error by Anonymous Monk
in thread isn't numeric in substr error by begood321

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