PHP Remove subarray from main array if specific value range is found - php

Question

Lets say I have the following array:
[9] => Array
(
[0] => Bob Smith
[1] => bobsmith#gmail.com
[2] => Helsinki
[3] => 10
[4] => 34
[5] => 2014-05-12
)
[10] => Array
(
[0] => John Smith
[1] => johnsmith#domain.com
[2] => some values
[3] => 9
[4] => 67
[5] => 2014-05-15
)
[11] => Array
(
[0] => Clarke Kent
[1] => ckent#superman.com
[2] => Crystal
[3] => 9
[4] => 89
[5] => 2014-05-16
)
What if i want to remove a subarray when the date falls outside a specific range. So if i say wanted to find data where the date is between 2014-05-14 and 2014-05-28. Then the (new) array would print the following:
[10] => Array
(
[0] => John Smith
[1] => johnsmith#domain.com
[2] => some values
[3] => 9
[4] => 67
[5] => 2014-05-15
)
[11] => Array
(
[0] => Clarke Kent
[1] => ckent#superman.com
[2] => Crystal
[3] => 9
[4] => 89
[5] => 2014-05-16
)
I thought something like the following:
foreach ($array as $row) {
if($row[5] >= '2014-05-14' && $row[5] <= '2014-05-14') {
// Do Something // e.g. unset subarray?
}
}
OR should i approach it differently and iterate through the array and if a subarray matches my criteria create a new array. The result being an array with subarrays that contain dates that meet my date range. I hope this makes sense, i am trying to find the most efficient way to do this.
Thanks

Answer 1

For the use case described, I would personally use array_filter:
$start_date = DateTime::createFromFormat('Y-m-d', '2014-05-14');
$end_date = DateTime::createFromFormat('Y-m-d', '2014-06-14');
$filtered_array = array_filter($array, function($row) use ($start_date, $end_date) {
$date = DateTime::createFromFormat('Y-m-d', $row[5]);
return $date >= $start_date && $date <= $end_date;
});