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@ 2019-09-30T08:05:22Z

<?php

$arr = array (
    0 => 
    array (
        0 => 
        array (
            'personNum' => 2,
            'type' => 'comment',
            'datetime' => '2019-05-15 11:29:45'
        ),
        1 => 
        array (
            'personNum' => 3,
            'type' => 'status',
            'datetime' => '2019-05-26 15:59:53'
        )
    ),
        1 => 
        array (
            0 => 
            array (
                'personNum' => 3,
                'type' => 'status',
                'datetime' => '2019-05-26 15:59:53'
            ),
            1 => 
            array (
                'personNum' => 4,
                'type' => 'status',
                'datetime' => '2019-05-26 16:04:24'
            ),
        
    )
);
array_walk($arr, function (&$v) { array_multisort(array_column($v, 'datetime'), SORT_DESC, $v); });
usort($arr, function ($a, $b) {
    return strcmp(max(array_column($b, 'datetime')), max(array_column($a, 'datetime')));
});
print_r($arr);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [0] => Array ( [personNum] => 4 [type] => status [datetime] => 2019-05-26 16:04:24 ) [1] => Array ( [personNum] => 3 [type] => status [datetime] => 2019-05-26 15:59:53 ) ) [1] => Array ( [0] => Array ( [personNum] => 3 [type] => status [datetime] => 2019-05-26 15:59:53 ) [1] => Array ( [personNum] => 2 [type] => comment [datetime] => 2019-05-15 11:29:45 ) ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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