array(1) { [18124]=> array(2) { [2]=> array(5) { [0]=> string(6) "鐵路" [1]=> string(6) "游客" [2]=> string(6) "隱患" [3]=> string(6) "隧道" [4]=> string(6) "南京" } [4]=> array(1) { [0]=> string(9) "觀察者" } } }