Replace multiple concatenations with a single statement. That is, replace

                $recordHeader = "RECORD\n"; # First value in the heade
+r
               
                $recordHeader .= "#addkey\n";
                $recordHeader .= "#filename FF\n";
                $recordHeader .= "#input_id 001\n";
[download]

with

                $recordHeader = "RECORD\n#addkey\n#filename FF\n#input
+_id 001\n";
[download]