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@ 2021-02-06T11:47:05Z

<?php

$myarray = array(
        [
            'messageId' => '5ACE9D8841',
            'sender' => 'john@doe.com',
        ],
        [
            'messageId' => '7EE67D8170',
            'sender' => 'dan@doe.com',
        ],
        [
            'messageId' => '8095FD8836',
            'sender' => 'cat@doe.com',
        ],
        [
            'messageId' => ['brokenId' => '8095FD8836'],
            'sender' => 'cat@doe.com',
        ],
        [
            'status' => 'wrong row',
        ],
        [
            'messageId' => '7EE67D8170',
            'dest' => 'mitch@doe.com',
            'status' => 'sent',
            'date' => '2021-02-01 11:06:55',
        ],
);


$result = array_reduce($myarray, function($rows, $item){
    if (array_key_exists('messageId', $item) && is_scalar($item['messageId'])) {
        $rows = array_replace_recursive($rows ?? [], [$item['messageId'] => $item]);
    }
    return $rows;
});

$result = array_values($result);

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [messageId] => 5ACE9D8841 [sender] => john@doe.com ) [1] => Array ( [messageId] => 7EE67D8170 [sender] => dan@doe.com [dest] => mitch@doe.com [status] => sent [date] => 2021-02-01 11:06:55 ) [2] => Array ( [messageId] => 8095FD8836 [sender] => cat@doe.com ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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