Online PHP editor | output for aGU5D

@ 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 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 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 ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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