array(3) {
  [0]=>
  array(3) {
    ["id"]=>
    string(1) "1"
    ["username"]=>
    string(6) "欣欣"
    ["passwd"]=>
    string(6) "xinxin"
  }
  [1]=>
  array(3) {
    ["id"]=>
    string(1) "2"
    ["username"]=>
    string(9) "玩命牛"
    ["passwd"]=>
    string(10) "wanmingniu"
  }
  [2]=>
  array(3) {
    ["id"]=>
    string(1) "3"
    ["username"]=>
    string(4) "test"
    ["passwd"]=>
    string(4) "test"
  }
}