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@ 2024-02-12T02:58:42Z

<?php

// First Array
$a = [
    [
        "sales" => [
            ["Date" => "2014-04-01", "Units" => 1],
            ["Date" => "2014-04-02", "Units" => 7]
        ]
    ]
];

$b = [
    [
        "sales" => [
            ["Date" => "2014-04-01", "Units" => 3],
            ["Date" => "2014-04-02", "Units" => 2]
        ]
    ]
];

$c = [
    [
        "sales" => [
            ["Date" => "2014-04-01", "Units" => 0],
            ["Date" => "2014-04-02", "Units" => 5]
        ]
    ]
];

$result = [];
foreach (array_merge($a[0]['sales'], $b[0]['sales'], $c[0]['sales']) as $row) {
    if (!isset($ref[$row['Date']])) {
        $ref[$row['Date']] = $row;
        $result[] =& $ref[$row['Date']];
    } else {
        $ref[$row['Date']]['Units'] += $row['Units'];
    }
}
var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'Date' => '2014-04-01', 'Units' => 4, ), 1 => array ( 'Date' => '2014-04-02', 'Units' => 14, ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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