variable and MySQL

Hi, I'm trying to make a script but have a problem ... How could I do this: I'd like to use $get_question_data[xxx_name_en] where xxx would be a variable variable according to the situation where the script is called... how would I do this? tried : $get_question_data[$test_name_en] $get_question_data[{$test}_name_en] ${get_question_data[$test_name_en]} but nothing works .... any help would be appreciated.