Online PHP editor | output for qrSQ0

<?php class CategoryTree { protected $roots = []; public function addCategory($category, $parent) { if ($this->categoryExists($this->roots, $category)) { throw new InvalidArgumentException(); } if ($parent === null) { $this->roots[$category] = []; return; } echo $parent; echo 'test'; $node = $this->findNode($parent, $this->roots); if(!isset($node)) { throw new InvalidArgumentException("Parent node: $parent not found."); } $node[$category] = []; } public function getChildren($parent) { $node = $this->findNode($parent, $this->roots); if(!isset($node)) { throw new InvalidArgumentException(); } return array_keys($node); } public function findNode($node, &$root) { print_r(array_keys($root)); if (in_array($node, array_keys($root))) { return $root[$node]; } foreach ($root as $n) { return $this->findNode($node, $n); } } public function categoryExists($nodes, $category) { $exists = false; foreach($nodes as $node) { if (in_array($category, $this->getChildren($node))) { return true; } $exists = $this->categoryExists($node, $category); } return $exists; } } // For testing purposes (do not submit uncommented): $c = new CategoryTree; $c->addCategory('A', null); //$c->addCategory('B', 'A'); //$c->addCategory('C', 'A'); //echo implode(',', $c->getChildren('A'));