Remove duplicate yyyy/mm from array - php

Question

How I can remove duplicate entries based on Year and Month when my date format is YYYY-MM-DD? I tried removing days, but then I need to add the last day in the array, so my approach was wrong.
My array looks like this:
Array
(
[0] => Array
(
[id] => 9240399
[time] => 2018-01-01
[pages_indexed] => 942
)
[1] => Array
(
[id] => 9240322
[time] => 2018-01-02
[pages_indexed] => 940
)
[2] => Array
(
[id] => 9240344
[time] => 2018-01-03
[pages_indexed] => 947
)
[30] => Array
(
[id] => 9240344
[time] => 2018-01-31
[pages_indexed] => 947
)
[31] => Array
(
[id] => 9240344
[time] => 2018-02-01
[pages_indexed] => 1999
)
[32] => Array
(
[id] => 9240344
[time] => 2018-02-02
[pages_indexed] => 13339
)
Notice that I skipped some entries, so my dates are 2018-01-01, 2018-01-02, etc.
Array_unique would not work here since the day is different.
I tried this: ( $entries['time'] is like ex: 2018-01-01. )
$remove = DATE("Y-m",$entries['time']);
$entriesa = array_unique($remove);
$entries['time'] = $entriesa;

Answer 1

Well... you could loop through your results and index each key as the Year and Month, and then update this index with the row that fits the pattern, meaning you would only have the rows you expect (but you would only have the last reference of them).
Like this:
$expectedArray = [];
foreach ($arrayDuplicated as $item) {
$indexKey = substr($item['time'], 0, 7);
$expectedArray[$indexKey] = $item;
}