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<?php declare(strict_types=1); $items = [ (object)['id' => 1, 'parentId' => 0, 'name' => "foo"], (object)['id' => 2, 'parentId' => 1, 'name' => "bar"], (object)['id' => 3, 'parentId' => 1, 'name' => "qux"], (object)['id' => 4, 'parentId' => 3, 'name' => "zip"], (object)['id' => 5, 'parentId' => 4, 'name' => "baz"] ]; $itemsById = []; foreach ($items as $item) { $itemsById[$item->id] = $item; } // --- foreach ($itemsById as $id => $item) { $itemsById[$item->parentId]->children[] = $item; } var_dump($itemsById);
Output for 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
Fatal error: Uncaught Error: Attempt to modify property "children" on null in /in/OBh3k:20 Stack trace: #0 {main} thrown in /in/OBh3k on line 20
Process exited with code 255.
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 Fatal error: Uncaught Error: Attempt to modify property "children" on null in /in/OBh3k:20 Stack trace: #0 {main} thrown in /in/OBh3k on line 20
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Creating default object from empty value in /in/OBh3k on line 20 array(6) { [1]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } [2]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [3]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } [4]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } [5]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } [0]=> object(stdClass)#6 (1) { ["children"]=> array(1) { [0]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } } } }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
array(6) { [1]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } [2]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [3]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } [4]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } [5]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } [0]=> object(stdClass)#6 (1) { ["children"]=> array(1) { [0]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } } } }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/OBh3k on line 2 array(6) { [1]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } [2]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [3]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } [4]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } [5]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } [0]=> object(stdClass)#6 (1) { ["children"]=> array(1) { [0]=> object(stdClass)#1 (4) { ["id"]=> int(1) ["parentId"]=> int(0) ["name"]=> string(3) "foo" ["children"]=> array(2) { [0]=> object(stdClass)#2 (3) { ["id"]=> int(2) ["parentId"]=> int(1) ["name"]=> string(3) "bar" } [1]=> object(stdClass)#3 (4) { ["id"]=> int(3) ["parentId"]=> int(1) ["name"]=> string(3) "qux" ["children"]=> array(1) { [0]=> object(stdClass)#4 (4) { ["id"]=> int(4) ["parentId"]=> int(3) ["name"]=> string(3) "zip" ["children"]=> array(1) { [0]=> object(stdClass)#5 (3) { ["id"]=> int(5) ["parentId"]=> int(4) ["name"]=> string(3) "baz" } } } } } } } } } }
preferences:
178.93 ms | 409 KiB | 183 Q