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@ 2018-04-20T05:28:41Z

<?php

$a = [
    'admin' => [
        [
            'id'                        => 3,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2000-01-01 00:00:00',
            'full_link'                 => 'admin/billing_contacts.app',
        ], [
            'id'                        => 1,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2018-04-19 13:18:59',
            'full_link'                 => 'admin/billing_contacts.app',
        ], [
            'id'                        => 2,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2018-04-15 13:18:59',
            'full_link'                 => 'admin/billing_contacts.app',
        ],
    ],
    'invoice' => [
        [
            'id'                        => 3,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2000-01-01 00:00:00',
            'full_link'                 => 'admin/create_invoice.app',
        ], [
            'id'                        => 1,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2018-04-19 13:18:59',
            'full_link'                 => 'admin/create_invoice.app',
        ], [
            'id'                        => 2,
            'user_type'                 => 'Accountant',
            'latest_user_activity_date' => '2018-04-20 13:18:59',
            'full_link'                 => 'admin/create_invoice.app',
        ],
    ],
];

function customSort(array $array)
{
    // Iterate through and sort second level array by most recent date
    foreach ($array as $key => &$value) {
        usort($value, function ($a, $b) {
            return strtotime($a['latest_user_activity_date']) < strtotime($b['latest_user_activity_date']) ? 1 : -1;
        });
    }
    
    // Sort first level array by date descending of first (most recent) entry
    uasort($array, function ($a, $b) {
        return strtotime($a[0]['latest_user_activity_date']) < strtotime($b[0]['latest_user_activity_date']) ? 1 : -1;
    });
    
    return $array;
}

print_r(customSort($a));

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: Array ( [invoice] => Array ( [0] => Array ( [id] => 2 [user_type] => Accountant [latest_user_activity_date] => 2018-04-20 13:18:59 [full_link] => admin/create_invoice.app ) [1] => Array ( [id] => 1 [user_type] => Accountant [latest_user_activity_date] => 2018-04-19 13:18:59 [full_link] => admin/create_invoice.app ) [2] => Array ( [id] => 3 [user_type] => Accountant [latest_user_activity_date] => 2000-01-01 00:00:00 [full_link] => admin/create_invoice.app ) ) [admin] => Array ( [0] => Array ( [id] => 1 [user_type] => Accountant [latest_user_activity_date] => 2018-04-19 13:18:59 [full_link] => admin/billing_contacts.app ) [1] => Array ( [id] => 2 [user_type] => Accountant [latest_user_activity_date] => 2018-04-15 13:18:59 [full_link] => admin/billing_contacts.app ) [2] => Array ( [id] => 3 [user_type] => Accountant [latest_user_activity_date] => 2000-01-01 00:00:00 [full_link] => admin/billing_contacts.app ) ) )

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