[x] => Array
(
[0] => 2015-08-26
[1] => 2015-08-27
[2] => 2015-08-28
[3] => 2015-08-29
[4] => 2015-08-30
[5] => 2015-08-31
[6] => 2015-09-01
[7] => 2015-09-02
)
[data] => Array
(
[0] => 0
[1] => 3
[2] => 1
[3] => 0
[4] => 0
[5] => 0
[6] => 3
[7] => 0
)
将数组[x]和[data]变化成一个新的二维数组
[0] => Array
(
[0] => 2015-08-26
[1] => 0
)
[1] => Array
(
[0] => 2015-08-27
[1] => 3
)
[2] => Array
(
[0] => 2015-08-28
[1] => 1
)
依此类推,把全部的数据转化成下面数组格式