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@ 2019-01-31T09:28:13Z

<?php

$a = [
     0 => [
         'period'     => '2017/2018',
         'product'    => 'AM',
         'quantity_1' => 20,
         'quantity'   => 25,
     ],
     1 => [
         'period'     => '2018/2019',
         'product'    => 'AM',
         'quantity_1' => 12,
         'quantity'   => 19,
     ],
     2 => [
         'period'     => '2017/2018',
         'product'    => 'DC',
         'quantity_1' => 20,
         'quantity'   => 25,
     ], 
     3 => [
         'period'     => '2018/2019',
         'product'    => 'DC',
         'quantity_1' => 8,
         'quantity'   => 10,
     ]
];
$temp = [];
    foreach ($a as $x){
        $temp[$x['product']][$x['period']] = $x;
    }
print_r($temp);

$result = [];
    foreach ($temp as $key => $res){
        $result[] = [
            'product'       => $key,
            'quantity_1'   => $res['2018/2019']['quantity_1'] / $res['2017/2018']['quantity_1'],
            'quantity_2'   => $res['2018/2019']['quantity'] / $res['2017/2018']['quantity'],
        ];
    }

    print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [AM] => Array ( [2017/2018] => Array ( [period] => 2017/2018 [product] => AM [quantity_1] => 20 [quantity] => 25 ) [2018/2019] => Array ( [period] => 2018/2019 [product] => AM [quantity_1] => 12 [quantity] => 19 ) ) [DC] => Array ( [2017/2018] => Array ( [period] => 2017/2018 [product] => DC [quantity_1] => 20 [quantity] => 25 ) [2018/2019] => Array ( [period] => 2018/2019 [product] => DC [quantity_1] => 8 [quantity] => 10 ) ) ) Array ( [0] => Array ( [product] => AM [quantity_1] => 0.6 [quantity_2] => 0.76 ) [1] => Array ( [product] => DC [quantity_1] => 0.4 [quantity_2] => 0.4 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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