No, “after the loop” means after the loop body, not after the loop condition:

foreach my $worksheet (...)
{
    ...
    foreach my $row (...)
    {
        ...
        if (...)               # filter out unwanted data, including h
+eader
        {
            send_data(...);    # send data extracted from the spreadsh
+eet
        }
    }
}

send_data(zipcode => 'DONE');  # NOW you're done!
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Hope that helps,