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<?php class CategoryTree { private $categories = []; public function addCategory(string $category, string $parent = null): void { $this->categories[$parent][] = $category; } public function getChildren(string $parent): array { return $this->categories[$parent]; } } $c = new CategoryTree; $c->addCategory('A', null); $c->addCategory('B', 'A'); $c->addCategory('C', 'A'); echo implode(',', $c->getChildren('A')); //Result should be "B,C" or "C,B"
Output for 7.1.32, 7.3.10 - 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 - 8.3.7
B,C
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 B,C
Output for 7.0.0 - 7.0.2
Fatal error: Uncaught TypeError: Return value of CategoryTree::addCategory() must be an instance of void, none returned in /in/LoQ0i:10 Stack trace: #0 /in/LoQ0i(20): CategoryTree->addCategory('A', NULL) #1 {main} thrown in /in/LoQ0i on line 10
Process exited with code 255.
preferences:
157.62 ms | 401 KiB | 148 Q