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@ 2020-12-14T14:49:52Z

<?php

$rows = [
    ["Reservation" => ["adult_price" => 2000, "adult_count" => 2]],
    ["Reservation" => ["adult_price" => 1000, "adult_count" => 1]],
    ["Reservation" => ["adult_price" => 500, "adult_count" => 4]],
    ["Reservation" => ["adult_price" => 2000, "adult_count" => 3]],
    ["Reservation" => ["adult_price" => 2000, "adult_count" => 2]],
    ["Reservation" => ["adult_price" => 1000, "adult_count" => 1]],
    ["Reservation" => ["adult_price" => 500, "adult_count" => 4]],
    ["Reservation" => ["adult_price" => 2000, "adult_count" => 3]],
];

$result = [];
foreach ($rows as $row) {
    if (!isset($result[$row['Reservation']['adult_price']])) {
        $result[$row['Reservation']['adult_price']] = $row;
    } else {
        $result[$row['Reservation']['adult_price']]['Reservation']['adult_count'] += $row['Reservation']['adult_count'];
    }
}
var_export(array_values($result));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'Reservation' => array ( 'adult_price' => 2000, 'adult_count' => 10, ), ), 1 => array ( 'Reservation' => array ( 'adult_price' => 1000, 'adult_count' => 2, ), ), 2 => array ( 'Reservation' => array ( 'adult_price' => 500, 'adult_count' => 8, ), ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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