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@ 2019-12-26T19:52:49Z

<?php

$input = [
  ['pc', ['pc', null, null], 'id' => 1, 'pid' => 0],
  ['laptop', ['pc', 'laptop', null], 'id' => 2, 'pid' => 0],
  ['acc', ['pc', 'acc', null], 'id' => 3, 'pid' => 0],
  ['bags', ['pc', 'acc', 'bags'], 'id' => 4, 'pid' => 0],
  ['adapter', ['pc', 'acc', 'adapter'], 'id' => 5, 'pid' => 0],
  ['clothes', ['clothes', null, null], 'id' => 6, 'pid' => 0]
];

function fillParentIds(array $input): array
{
  return array_values(array_reduce($input, static function ($entriesByPath, $entry) {
    $hierarchy = array_filter($entry[1]);
    $pathToParent = implode('/', array_slice($hierarchy, 0, -1));
    $pathToEntry = implode('/', $hierarchy);

    $entry['pid'] = array_key_exists($pathToParent, $entriesByPath) ? $entriesByPath[$pathToParent]['id'] : $entry['id'];

    $entriesByPath[$pathToEntry] = $entry;
    return $entriesByPath;
  }, []));
}

print_r(fillParentIds($input));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [0] => pc [1] => Array ( [0] => pc [1] => [2] => ) [id] => 1 [pid] => 1 ) [1] => Array ( [0] => laptop [1] => Array ( [0] => pc [1] => laptop [2] => ) [id] => 2 [pid] => 1 ) [2] => Array ( [0] => acc [1] => Array ( [0] => pc [1] => acc [2] => ) [id] => 3 [pid] => 1 ) [3] => Array ( [0] => bags [1] => Array ( [0] => pc [1] => acc [2] => bags ) [id] => 4 [pid] => 3 ) [4] => Array ( [0] => adapter [1] => Array ( [0] => pc [1] => acc [2] => adapter ) [id] => 5 [pid] => 3 ) [5] => Array ( [0] => clothes [1] => Array ( [0] => clothes [1] => [2] => ) [id] => 6 [pid] => 6 ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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