Ами помъчих се и в крайна сметка се оказа, че нито един от предлаганите варианти за баркод не съответства на нужния ми "GS1-DataBar Expanded":
$arrcode = $this->barcode_code39($code, false, true);
$arrcode = $this->barcode_code39($code, true, false);
$arrcode = $this->barcode_code39($code, true, true);
$arrcode = $this->barcode_code93($code);
$arrcode = $this->barcode_s25($code, false);
$arrcode = $this->barcode_s25($code, true);
$arrcode = $this->barcode_i25($code, false);
$arrcode = $this->barcode_i25($code, true);
$arrcode = $this->barcode_c128($code, '');
$arrcode = $this->barcode_c128($code, 'A');
$arrcode = $this->barcode_c128($code, 'B');
$arrcode = $this->barcode_c128($code, 'C');
$arrcode = $this->barcode_eanext($code, 2);
$arrcode = $this->barcode_eanext($code, 5);
$arrcode = $this->barcode_eanupc($code, 8);
$arrcode = $this->barcode_eanupc($code, 13);
$arrcode = $this->barcode_eanupc($code, 12);
$arrcode = $this->barcode_eanupc($code, 6);
$arrcode = $this->barcode_msi($code, false);
$arrcode = $this->barcode_msi($code, true);
$arrcode = $this->barcode_postnet($code, false);
$arrcode = $this->barcode_postnet($code, true);
$arrcode = $this->barcode_rms4cc($code, false);
$arrcode = $this->barcode_rms4cc($code, true);
$arrcode = $this->barcode_imb($code);
$arrcode = $this->barcode_imb_pre($code);
$arrcode = $this->barcode_codabar($code);
$arrcode = $this->barcode_code11($code);
$arrcode = $this->barcode_pharmacode($code);
$arrcode = $this->barcode_pharmacode2t($code);