Online PHP editor | rfc for PUlik

@ 2023-05-29T21:04:22Z

<?php

$items = [
    ['item1' => 'a', 'item2' => 'c', 'item3' => 'd2', 'item4' => 'f'],
    ['item1' => 'a', 'item2' => 'c', 'item3' => 'd2', 'item4' => 'g'],
    ['item1' => 'a', 'item2' => 'd', 'item3' => 'd3', 'item4' => 'h'],
    ['item1' => 'a', 'item2' => 'd', 'item3' => 'e', 'item4' => 'i'],
    ['item1' => 'b', 'item2' => 'c', 'item3' => 'e', 'item4' => 'j'],
    ['item1' => 'b', 'item2' => 'c', 'item3' => 'e', 'item4' => 'k']
];

$result = [];
foreach ($items as $row) {
    $k1 = $row['item1'];
    $k2 = $row['item1'] . '_' . $row['item2'];
    $k3 = $row['item1'] . '_' . $row['item2'] . '_' . $row['item3'];
    if (!isset($ref3[$k3])) {
        $ref3[$k3] = [$row['item3'], [$row['item4']]];
        if (!isset($ref2[$k2])) {
            $ref2[$k2] = [$row['item2'], &$ref3[$k3]];
            if (!isset($ref1[$k1])) {
                $ref1[$k1] = [$row['item1'], &$ref2[$k2]];
                $result[] = &$ref1[$k1];
            } else {
                $ref1[$k1][] = &$ref2[$k2];
            }
        } else {
            $ref2[$k2][1][] = &$ref3[$k3];
        }
    } else {
        $ref3[$k3][1][] = $row['item4'];
    }
}
echo json_encode($result);

Output for git.master, git.master_jit, rfc.property-hooks: [["a",["c",["d2",["f","g"]]],["d",["d3",["h"],["e",["i"]]]]],["b",["c",["e",["j","k"]]]]]

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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