241 	protected function barcode_code39($code, $extended=false, $checksum=false) {  argument
294 		if ($checksum) {
573 		$checksum = $c.$k;
575 		$checksum = strtr($checksum, '<=>?', chr(128).chr(131).chr(129).chr(130));
576 		return $checksum;
611 	protected function barcode_msi($code, $checksum=false) {  argument
628 		if ($checksum) {
670 	protected function barcode_s25($code, $checksum=false) {  argument
681 		if ($checksum) {
742 	protected function barcode_i25($code, $checksum=false) {  argument
755 		if ($checksum) {