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@ 2017-08-23T08:33:22Z

<?php
$array = Array
(
    0 => Array
    (
        'date' => '2017-08-22',
        'AAA' => '1231',
    ),
    1 => Array
    (
        'date' => '2017-08-21',
        'AAA' => '1172',
    ),
    2 => Array
    (
        'date' => '2017-08-20',
        'AAA' => '1125'
    ),
    3 => Array
    (
        'date' => '2017-08-21',
        'BBB' => '251'
    ),
    4 => Array
    (
        'date' => '2017-08-20',
        'BBB' => '21773',
    ),
    5 => Array
    (
        'date' => '2017-08-22',
        'CCC' => '3750'
    ),
    6 => Array
    (
        'date' => '2017-08-20',
        'CCC' => '321750'
    )
);
echo '<pre>';
$array1 = array('AAA' => null, 'BBB' => null, 'CCC' => null);
$array2 = array();

array_walk($array, function ($v) use (&$array2, $array1) {
    $a = $v['date'];
    if (!isset($array2[$a])) {
        $array2[$a] = $array1;
    }
    unset($v['date']);
    $array2[$a] = array_merge($array2[$a], $v);
});

print_r($array2);

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [2017-08-22] => Array ( [AAA] => 1231 [BBB] => [CCC] => 3750 ) [2017-08-21] => Array ( [AAA] => 1172 [BBB] => 251 [CCC] => ) [2017-08-20] => Array ( [AAA] => 1125 [BBB] => 21773 [CCC] => 321750 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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