add debug

booking.variety_admin.inc

@@ -600,6 +600,10 @@ function booking_varietysessions_csv_report($timeslot_id) {
     $column_headings[] = array($heading => 'string');
   }
   
+ watchdog('booking_debug', "<pre>Variety session spreadsheet columns\n@info</pre>", 
+  array('@info' => print_r( $column_headings, true)));
+  
+
   // Calculate each row based on column headings
   for ($i = 0; $i < max($maximums); $i++) {
     $output = array();