public static function add_invoice_line_items(Harvest_Invoice $invoice, SI_Invoice $new_invoice)
 {
     // Format the csv string to compensate for bad formatting and missing values.
     $csv_string = $invoice->csv_line_items;
     // Create rows for each line item. Making sure to not break with wrapped line items.
     // https://bugs.php.net/bug.php?id=55763
     $lines = preg_split('/[\\r\\n]{1,2}(?=(?:[^\\"]*\\"[^\\"]*\\")*(?![^\\"]*\\"))/', $csv_string);
     // Build array for each line item
     $row_arrays = array_map('str_getcsv', $lines);
     // Header row
     $header = array_shift($row_arrays);
     // Rename the key names to match what SI uses
     $header = str_replace(array('unit_price', 'quantity', 'description', 'kind', 'amount'), array('rate', 'qty', 'desc', 'type', 'total'), $header);
     // Build a line item associated array with header names
     $line_items = array();
     foreach ($row_arrays as $row) {
         if (strlen(implode('', $row)) > 0) {
             // Don't add empty rows
             $line_items[] = array_combine($header, $row);
         }
     }
     // Set the line items meta
     $new_invoice->set_line_items($line_items);
 }