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--TEST-- marc_field_003: Add subfields to an existing field --SKIPIF-- --FILE-- appendSubfield($subfield1); // insert a new subfield after the first subfield with code 'z' // expected order: a-z-k-g $sf = $field->getSubfields('z'); // we might get an array back; in this case, we want the first subfield if (is_array($sf)) { $field->insertSubfield($subfield2, $sf[0]); } else { $field->insertSubfield($subfield2, $sf); } // insert a new subfield prior to the first subfield with code 'z' // expected order: a-t-z-k-g $sf = $field->getSubfields('z'); // we might get an array back; in this case, we want the first subfield if (is_array($sf)) { $field->insertSubfield($subfield3, $sf[0], true); } else