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@ 2020-04-21T15:45:04Z

<?php
// Assume that this is the data that we get back from get_users or a similar function
$users = array(
	0 => array(
		'name' => 'Tom',
		'payments' => array(
			0 => array(
				'date' => '2020-04-15',
				'amount' => '750',
			),
			1 => array(
				'date' => '2020-04-20',
				'amount' => '900',
			),
		),
	),
	1 => array(
		'name' => 'Dick',
		'payments' => array(
			0 => array(
				'date' => '2020-04-10',
				'amount' => '750',
			),
			1 => array(
				'date' => '2020-04-15',
				'amount' => '900',
			),
			2 => array(
				'date' => '2020-04-25',
				'amount' => '1250',
			),
		),
	),
	2 => array(
		'name' => 'Harry',
		'payments' => array(
			0 => array(
				'date' => '2020-04-24',
				'amount' => '750',
			),
		),
	),
);

function sort_users_by_date( $user1, $user2 ) {
	$date1 = end($user1['payments'])['date'];
	$date2 = end($user2['payments'])['date'];

	return strtotime($date2) - strtotime($date1);
}

usort($users, 'sort_users_by_date');

var_dump($users);

Output for 7.2.0 - 7.2.33, 7.3.0 - 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(3) { [0]=> array(2) { ["name"]=> string(4) "Dick" ["payments"]=> array(3) { [0]=> array(2) { ["date"]=> string(10) "2020-04-10" ["amount"]=> string(3) "750" } [1]=> array(2) { ["date"]=> string(10) "2020-04-15" ["amount"]=> string(3) "900" } [2]=> array(2) { ["date"]=> string(10) "2020-04-25" ["amount"]=> string(4) "1250" } } } [1]=> array(2) { ["name"]=> string(5) "Harry" ["payments"]=> array(1) { [0]=> array(2) { ["date"]=> string(10) "2020-04-24" ["amount"]=> string(3) "750" } } } [2]=> array(2) { ["name"]=> string(3) "Tom" ["payments"]=> array(2) { [0]=> array(2) { ["date"]=> string(10) "2020-04-15" ["amount"]=> string(3) "750" } [1]=> array(2) { ["date"]=> string(10) "2020-04-20" ["amount"]=> string(3) "900" } } } }

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