array(13) { ["tId"]=> string(2) "28" ["sId"]=> string(2) "19" ["cId"]=> string(2) "21" ["theme"]=> string(1) "q" ["option"]=> string(15) "A 1;B 2;C 3;D 4" ["answer"]=> string(1) "a" ["key"]=> string(1) "a" ["gre"]=> string(4) "2011" ["add_time"]=> string(19) "2014-03-05 22:20:11" ["sat"]=> int(2) ["aset"]=> string(14) "20140305102011" ["answercount"]=> int(4) ["dif"]=> int(1) }
其中 asset answercount 在库里都为null 求解