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@ 2020-02-13T12:40:25Z

<?php

$cms = Array
(
    '0' => Array
        (
            'id' => 31,
            'day_date' => '2020-01-30 00:00:00',
            'new_visitors' => 459
        ),

    '1' => Array
        (
            'id' => 32,
            'day_date' => '2020-01-31 00:00:00',
            'new_visitors' => 338
        ),

    '2' => Array
        (
            'id' => 33,
            'day_date' => '2020-02-01 00:00:00',
            'new_visitors' => 242
        ),

    '3' => Array
        (
            'id' => 34,
            'day_date' => '2020-02-02 00:00:00',
            'new_visitors' => 219
        )

);

$tmp_array = array();
foreach ($cms as $key => $val) {

    $cDate = date('Ym', strtotime($val['day_date']));

    if (array_key_exists($cDate, array_keys($tmp_array))) {
        $tmp_array[$cDate]['new_visitors'] += $val['new_visitors'];
    } else {
        $tmp_array[$cDate]['new_visitors'] = $val['new_visitors'];
    }
    $tmp_array[$cDate]['ids'][] = $val['id'];

}

print_r($tmp_array);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [202001] => Array ( [new_visitors] => 338 [ids] => Array ( [0] => 31 [1] => 32 ) ) [202002] => Array ( [new_visitors] => 219 [ids] => Array ( [0] => 33 [1] => 34 ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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