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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 git.master, git.master_jit, rfc.property-hooks: 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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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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