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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 git.master, git.master_jit, rfc.property-hooks
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.

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