PHP: Manipulating and removing duplicate element conditionally on Multidimensional array - php

Question

I have following multidimensional array. I am not getting suitable title for my question. You are free to edit and change.
Array(
[2018-05-01] => Array
(
[0] => Array
(
[Zone] => 0
[Time] => 13:06
)
[1] => Array
(
[Zone] => 0
[Time] => 13:08
)
[2] => Array
(
[Zone] => 2
[Time] => 13:10
)
[3] => Array
(
[Zone] => 2
[Time] => 13:14
)
[4] => Array
(
[Zone] => 0
[Time] => 13:16
)
[5] => Array
(
[Zone] => 0
[Time] => 13:17
)
[6] => Array
(
[Zone] => 2
[Time] => 13:21
)
[7] => Array
(
[Zone] => 2
[Time] => 13:25
)
[8] => Array
(
[Zone] => 0
[Time] => 13:28
)
[9] => Array
(
[Zone] => 0
[Time] => 13:32
)
)
[2018-05-04] => Array
(
[0] => Array
(
[Zone] => 1
[Time] => 13:26
)
[1] => Array
(
[Zone] => 1
[Time] => 13:28
)
[2] => Array
(
[Zone] => 1
[Time] => 13:30
)
[3] => Array
(
[Zone] => 0
[Time] => 13:34
)
[4] => Array
(
[Zone] => 0
[Time] => 13:36
)
[5] => Array
(
[Zone] => 1
[Time] => 13:37
)
[6] => Array
(
[Zone] => 1
[Time] => 13:41
)
)
)
I have to manipulate above array in such a way that, Same Zone should not come simultaneously. And this depend upon the conditions -
Condition 1
If Sub array has only Zone => 0 and Zone => 2. For example array with key 2018-05-01 has only 0 and 2 as Zones.
We will only fetch First Zone => 0, last Zone => 2 , first Zone => 0 and again last Zone => 2.
Note here, if there is no Zone => 2 after Zone => 0, then in this case we fetch last Zone => 0 instead of first Zone => 0.
Please see my output for clearification.
Condition 2
If Sub array has Zone => 1. For example array with key 2018-05-04. We will fetch only First occurrence of each.
Here is the desired output
Array(
[2018-05-01] => Array
(
[0] => Array
(
[Zone] => 0
[Time] => 13:06
)
[3] => Array
(
[Zone] => 2
[Time] => 13:14
)
[4] => Array
(
[Zone] => 0
[Time] => 13:16
)
[7] => Array
(
[Zone] => 2
[Time] => 13:25
)
[9] => Array
(
[Zone] => 0
[Time] => 13:32
)
)
[2018-05-04] => Array
(
[0] => Array
(
[Zone] => 1
[Time] => 13:26
)
[3] => Array
(
[Zone] => 0
[Time] => 13:34
)
[5] => Array
(
[Zone] => 1
[Time] => 13:37
)
)
)
What I have tried is -
What I have been thinking of doing is using array_column to check if the sub array has "1" as Zone value. If yes then we will implement condition 1 otherwise Condition 2. Then loop through each subarray and comparing current iteration with previous one. But I am not getting exact view, and I m doubtful if this will be an elegant solution.