Online PHP editor | output for oeXHR

@ 2018-08-20T23:00:28Z

<?php

$array1 = [
    '0' => '2018-08-21 10:00:00',
    '1' => '2018-08-28 10:00:00',
    '2' => '2018-09-04 10:00:00',
    '3' => '2018-09-11 10:00:00',
    '4' => '2018-09-18 10:00:00',
];

$array2 = [
    '0' => '2018-08-21 10:00:00',
    '1' => '2018-08-28 10:00:00',
    '2' => '2018-09-04 10:00:00',
    '3' => '2018-09-11 10:00:00',
    '4' => '2018-09-18 10:00:00',
    '5' => '2019-09-18 10:00:00',
];

$diff = array_diff($array2, $array1);

var_dump($array1, $array2, $diff);

Output for 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: array(5) { [0]=> string(19) "2018-08-21 10:00:00" [1]=> string(19) "2018-08-28 10:00:00" [2]=> string(19) "2018-09-04 10:00:00" [3]=> string(19) "2018-09-11 10:00:00" [4]=> string(19) "2018-09-18 10:00:00" } array(6) { [0]=> string(19) "2018-08-21 10:00:00" [1]=> string(19) "2018-08-28 10:00:00" [2]=> string(19) "2018-09-04 10:00:00" [3]=> string(19) "2018-09-11 10:00:00" [4]=> string(19) "2018-09-18 10:00:00" [5]=> string(19) "2019-09-18 10:00:00" } array(1) { [5]=> string(19) "2019-09-18 10:00:00" }

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