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@ 2018-06-19T19:17:47Z

<?php
class Notification
{
    public $is_notifyable;
    public $children = [];
}

function mergeNotifications(Notification ... $notifications) : array
{
    $result = [];

    foreach ($notifications as $notification) {
        // Can no longer be "empty"
        // if (empty($notification)) continue;

        // is_notifyable is now a promise that your interface made:
        if ($notification->is_notifyable) {
            $result[] = $notification;
        }
        else
        {
            // flatten the notifications recursively:
            foreach(mergeNotifications(...$notification->children) as $child)
            {
                $result[] = $child;
            }
        }
    }
    
    return $result;
}

$arr = [
    new Notification(),
    new Notification(),
];

var_dump(mergeNotifications(...$arr));

Output for git.master, git.master_jit, rfc.property-hooks: array(0) { }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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