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@ 2022-12-13T19:07:03Z

<?php

Class Unit{
    public function __construct(public readonly ?string $name){}
}

Class Branch{
    public array $units = [];
    public function __construct(public readonly ?string $name){}
}

Class Group{
    public array $branches = [];
    public function __construct(public readonly string $name){}
}

$sampleData = [
    ['g1', 'b1',   null],
    ['g1', 'b1',   'u2'],
    ['g2', null,   'u3'],
    ['g2', 'b6',   'u4'],
    ['g3', 'b7',   'u5'],
];

$groups = [];
foreach($sampleData as $row){
    $groupId  = $row[0];
    $branchId = $row[1];
    $unitId   = $row[2];
    
    if(!isset($groups[$groupId])){
        $groups[$groupId] = new Group($groupId);
    }
    
    if(!isset($groups[$groupId]->branches[$branchId])){
        $groups[$groupId]->branches[$branchId] = new Branch($branchId);
    }
    
    if(!isset($groups[$groupId]->branches[$branchId]->units[$unitId])){
        $groups[$groupId]->branches[$branchId]->units[$unitId] = new Unit($unitId);
    }
}



var_dump($groups);

Output for git.master_jit, git.master: array(3) { ["g1"]=> object(Group)#1 (2) { ["branches"]=> array(1) { ["b1"]=> object(Branch)#2 (2) { ["units"]=> array(2) { [""]=> object(Unit)#3 (1) { ["name"]=> NULL } ["u2"]=> object(Unit)#4 (1) { ["name"]=> string(2) "u2" } } ["name"]=> string(2) "b1" } } ["name"]=> string(2) "g1" } ["g2"]=> object(Group)#5 (2) { ["branches"]=> array(2) { [""]=> object(Branch)#6 (2) { ["units"]=> array(1) { ["u3"]=> object(Unit)#7 (1) { ["name"]=> string(2) "u3" } } ["name"]=> NULL } ["b6"]=> object(Branch)#8 (2) { ["units"]=> array(1) { ["u4"]=> object(Unit)#9 (1) { ["name"]=> string(2) "u4" } } ["name"]=> string(2) "b6" } } ["name"]=> string(2) "g2" } ["g3"]=> object(Group)#10 (2) { ["branches"]=> array(1) { ["b7"]=> object(Branch)#11 (2) { ["units"]=> array(1) { ["u5"]=> object(Unit)#12 (1) { ["name"]=> string(2) "u5" } } ["name"]=> string(2) "b7" } } ["name"]=> string(2) "g3" } }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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