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@ 2015-06-18T15:46:34Z

<?php
class CategoryTree
{
	private $catTree = array();

    public function addCategory($category, $parent)
    {
    	if($parent == null){
    		if(count(array_column($this->catTree, 'category'), $category) > 0){
    		    echo 'Duplicate category';
    		}
    	}
    	else{
    		
    	}
    	$temp = array("category" => $category,"parent" => $parent);
    	array_push($this->catTree,$temp);
    }
    
    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('C', 'A');

echo implode(',', $c->getChildren('A'));

Output for rfc.property-hooks, git.master, git.master_jit: Fatal error: Uncaught TypeError: count(): Argument #2 ($mode) must be of type int, string given in /in/BkvjC:9 Stack trace: #0 /in/BkvjC(9): count(Array, 'A') #1 /in/BkvjC(31): CategoryTree->addCategory('A', NULL) #2 {main} thrown in /in/BkvjC on line 9
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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