array(6) { [0]=> string(61) "最优控制-彭辉\Optimal Control - An undergraduate course" [1]=> string(6) " Vol.1" [2]=> string(10) " Chapter 1" [3]=> string(5) "2.pdf" [4]=> string(8) " 2063777" [5]=> string(21) " 2012-03-19 17:02:1 " } array(7) { [0]=> string(61) "最优控制-彭辉\Optimal Control - An undergraduate course" [1]=> string(6) " Vol.2" [2]=> string(10) " Chapter 3" [3]=> string(1) "4" [4]=> string(5) "5.pdf" [5]=> string(8) " 2556142" [6]=> string(21) " 2012-03-28 16:10:3 " } array(7) { [0]=> string(61) "最优控制-彭辉\Optimal Control - An undergraduate course" [1]=> string(6) " Vol.3" [2]=> string(10) " Chapter 6" [3]=> string(1) "7" [4]=> string(5) "8.pdf" [5]=> string(8) " 3396081" [6]=> string(21) " 2012-03-17 17:24:0 " }