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@ 2018-11-02T11:59:31Z

<?php

$groupByCols = ['a', 'b'];
$rows = [
    [
        'a' => 1,
        'b' => 10,
        'c' => 100
    ],
    [
        'a' => 1,
        'b' => 20,
        'c' => 200
    ],
    [
        'a' => 1,
        'b' => 20,
        'c' => 300
    ],
    [
        'a' => 1,
        'b' => 30,
        'c' => 400
    ],
    [
        'a' => 2,
        'b' => 40,
        'c' => 500
    ],
    [
        'a' => 2,
        'b' => 50,
        'c' => 600
    ],
    [
        'a' => 3,
        'b' => 60,
        'c' => 700
    ]
];
function group_by($array, $columns) {
    $new_arr = array();
    $column = array_shift($columns);
    foreach ($array as $arr) {
        $new_arr[$arr[$column]][] = $arr;
    }
    if (count($columns)) {
        foreach ($new_arr as &$arr) {
            $arr = group_by($arr, $columns);
        }
    }
    return array_values($new_arr);
}
print_r(group_by($rows, $groupByCols));

Output for git.master_jit, git.master, rfc.property-hooks: Array ( [0] => Array ( [0] => Array ( [0] => Array ( [a] => 1 [b] => 10 [c] => 100 ) ) [1] => Array ( [0] => Array ( [a] => 1 [b] => 20 [c] => 200 ) [1] => Array ( [a] => 1 [b] => 20 [c] => 300 ) ) [2] => Array ( [0] => Array ( [a] => 1 [b] => 30 [c] => 400 ) ) ) [1] => Array ( [0] => Array ( [0] => Array ( [a] => 2 [b] => 40 [c] => 500 ) ) [1] => Array ( [0] => Array ( [a] => 2 [b] => 50 [c] => 600 ) ) ) [2] => Array ( [0] => Array ( [0] => Array ( [a] => 3 [b] => 60 [c] => 700 ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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