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run code in 200+ php & hhvm versions
Bugs & Features
<?php class CategoryTree { private $catTree = array(); public function addCategory($category, $parent) { if($parent == null){ //echo count(array_column($this->catTree, 'category')); if(count(array_column($this->catTree, 'category', $category)) > 0){ echo 'Duplicate category'; } else{ $temp = array("category" => $category,"parent" => $parent); array_push($this->catTree,$temp); } } else{ echo 'Parent: ' . $parent; //print_r(array_column($this->catTree, 'parent', $parent)); print_r(count(array_keys(array_column($this->catTree, 'parent'), $parent))); } } public function getChildren($parent) { $that = $this; $keys = array_keys(array_column($this->catTree, 'parent'), $parent); return array_map(function($k) use ($that){return $that->catTree[$k]['category'];}, $keys); } } // For testing purposes (do not submit uncommented): $c = new CategoryTree; $c->addCategory('A', null); $c->addCategory('A', null); $c->addCategory('B', 'A'); $c->addCategory('B', 'D'); $c->addCategory('C', 'A'); echo implode(',', $c->getChildren('A'));
Output for 5.5.0 - 7.2.6
Duplicate categoryParent: A0Parent: D0Parent: A0
Output for 5.3.0 - 5.4.45
Fatal error: Call to undefined function array_column() in /in/OpddF on line 10
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/OpddF on line 30
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/OpddF on line 30
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/OpddF on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/OpddF on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/OpddF on line 4
Process exited with code 255.