В Firefox проблемы с текстом, как исправить?

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В Firefox проблемы с текстом, как исправить?

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Php имя переменной с "_". Как ее напечатать?

Array ( [balance] => 207.6 [number] => Array ( [state] => 1 [clientId] => 54490 [client_id] => 54490 [first_name] => Константин Сергеевич [middle_name] => [last_name] => Новоселов [birth_date] => 1984-04-25 [phone] => 79028755603 [sex] => 1 [_card_state] => 0 [_card_id] => 60027 [_card_barcode] => 9993301175151 [_card_code] => 117515 [_bonus_percent] => 10.00 [_discount_percent] => 0.00 [result_code] => 0 [result_text] => Клиент найден [maxBonus] => 0 [max_bonus] => 0 [balance] => 207.6 [_bonus_sum_termless] => 207.6 [useCodeSms] => 1 [use_code_sms] => 1 [summCodeSms] => 1 [summ_code_sms] => 1 [useActivationCodeSms] => 1 [use_activation_code_sms] => 1 [onlyWithCards] => 1 [only_with_cards] => 1 [_purchases_sum] => 516.00 [bonus_pay_percent] => 40.00 [discount_percent] => 0.00 [program_type] => 0 [aname] => Бонусная - 10% )

нужно вывести _card_barcode

Php имя переменной с "_". Как ее напечатать?

Пишет Undefined index: _name