3v4l.org

run code in 300+ PHP versions simultaneously
<?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 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
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 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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 ) )
preferences:
167.86 ms | 405 KiB | 175 Q