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<?php class CategoryTree { protected $roots = []; public function addCategory($category, $parent) { if ($this->categoryExists($this->roots, $category) || !$this->categoryExists($this->roots, $parent)) { throw new InvalidArgumentException(); } if ($parent === null) { $this->tree[$category] = []; } $node = $findNode($parent, $this->root); if(!isset($node)) { throw new InvalidArgumentException(); } $node[$category] = []; } public function getChildren($parent) { $node = $findNode($parent, $this->root); if(!isset($node)) { throw new InvalidArgumentException(); } return array_keys($node); } public function findNode($node, &$root) { if (in_array($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'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught InvalidArgumentException in /in/VhC94:9 Stack trace: #0 /in/VhC94(55): CategoryTree->addCategory('A', NULL) #1 {main} thrown in /in/VhC94 on line 9
Process exited with code 255.

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