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@ 2020-10-09T08:33:41Z

<?php

$tests = [
    [
        '1@02@43@170@1',
        '1@02@43@176@1',
        '1@02@43@182@1',
        '1@02@42@182@1',
        '1@02@42@176@1',
    ],
    [
        '1@02@43@170@1',
        '1@02@43@176@1',
        '1@02@43@182@1',
        '1@02@42@182@1',
        '1@02@42@176@1',
        '1@03@43@170@1',
        '1@03@43@176@1',
        '1@03@43@182@1',
        '1@03@42@182@1',
        '1@03@42@176@1',
    ],
    [
        '1@02@43@170@1',
        '1@02@43@170@1',
    ]
];

function killYourParentIfYouHaveOne($level) {
    if (count($level) === 1) {
         $key = key($level);
         $level = is_array($level[$key]) ? killYourParentIfYouHaveOne($level[$key]) : [];
    }
    return $level;
}

function differingTree(array $array): array {
    $result = [];
    foreach ($array as $item) {
        [$a, $b, $c, $d, $e] = explode('@', $item, 5);
        $result[$a][$b][$c][$d] = $e;
    }
    return killYourParentIfYouHaveOne($result);
}

foreach ($tests as $test) {
    echo var_export(differingTree($test), true) . "\n---\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: array ( 43 => array ( 170 => '1', 176 => '1', 182 => '1', ), 42 => array ( 182 => '1', 176 => '1', ), ) --- array ( '02' => array ( 43 => array ( 170 => '1', 176 => '1', 182 => '1', ), 42 => array ( 182 => '1', 176 => '1', ), ), '03' => array ( 43 => array ( 170 => '1', 176 => '1', 182 => '1', ), 42 => array ( 182 => '1', 176 => '1', ), ), ) --- array ( ) ---

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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