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@ 2020-07-12T18:34:54Z

<?php
    
    declare(strict_types=1);
    
    $data = [
        '-MC1kTfrrDHY3ZbidJ4Q' => [
            'from' => 'lSUfZ4sgEJd',
            'message' => 'test message four no more!',
            'startedAt' => '2020-07-12 11:21:10',
            'to' => 'CWgPqdn3YweN',
        ],
        '-MC09BsjtXP0izITsThf' => [
            'from' => 'CWgPqdn3YweN',
            'message' => 'test message three',
            'startedAt' => '2020-07-11 11:20:19',
            'subject' => '-MC00BHCZlXUp25C5nlS',
            'to' => 'lSUfZ4sgEJd',
        ],
        '-MC1kAi1niswXtjY_h4s' => [
            'from' => 'CWgPqdn3YweN',
            'message' => 'test message two',
            'startedAt' => '2020-07-12 11:19:52',
            'to' => 'lSUfZ4sgEJd',
        ],
        '-MC1kOtfnIlAYtmJsD-a' => [
            'from' => 'CWgPqdn3YweN',
            'message' => 'test message one',
            'startedAt' => '2020-07-12 11:18:50',
            'to' => 'lSUfZ4sgEJd',
        ],
        '-MC1kOtfnIlAhgcufu' => [
            'from' => 'CWgPqdn3YweN',
            'message' => 'test message zero',
            'startedAt' => '2020-07-12 11:00:50',
            'to' => 'YLisXjk07w93',
        ],
    ];
    
    function getLatestUniqueConversationMessagesByUser(array $message, string $user): array
    {
        $conversations = [];
        $latestUniqueConversationMessages = [];
        
        foreach ($message as $messageKey => $message) {
            $participants = [$message['from'], $message['to']];
            
            // Skip entries where $user is has not participated (not sure if needed)
            if (!in_array($user, $participants)) { continue; }
            
            // Make "to|from" same as "from|to"
            sort($participants);
            $conversationKey = join('|', $participants);
            
            // Check if conversation has been handled already
            if (!array_key_exists($conversationKey, $conversations)) {
                $conversations[$conversationKey] = true; // Save as "handled"
                $latestUniqueConversationMessages[$messageKey] = $message; // Save actual data to return
            }
        }
        
        return $latestUniqueConversationMessages;
    }
    
    var_dump(getLatestUniqueConversationMessagesByUser($data, 'CWgPqdn3YweN'));

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["-MC1kTfrrDHY3ZbidJ4Q"]=> array(4) { ["from"]=> string(11) "lSUfZ4sgEJd" ["message"]=> string(26) "test message four no more!" ["startedAt"]=> string(19) "2020-07-12 11:21:10" ["to"]=> string(12) "CWgPqdn3YweN" } ["-MC1kOtfnIlAhgcufu"]=> array(4) { ["from"]=> string(12) "CWgPqdn3YweN" ["message"]=> string(17) "test message zero" ["startedAt"]=> string(19) "2020-07-12 11:00:50" ["to"]=> string(12) "YLisXjk07w93" } }

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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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