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@ 2016-04-06T21:25:03Z

<?php
$input = array(
    array("id" => "Cosmetics", "parent" => "Beauty"),
    array("id" => "Makeup", "parent" => "Cosmetics"),
    array("id" => "Beauty", "parent" => null)
);

$options = array();
$refs = array();

foreach($input as &$category) {
    $refs[$category["id"]] = $option = array(
        "id" => $category["id"],
        "options" => array()
    );
    print_r($refs);
    if($category["parent"]){
        if(!array_key_exists($category["parent"], $refs)) {
            $parent = array(
                "id" => $category["parent"],
                "options" => array(
                    &$refs[$category["id"]]
                )
            );
            $refs[$parent["id"]] = &$refs[$parent["id"]];
        } else {
            $refs[$category["parent"]]["options"][] = &$option;
           // print_r($refs[$category["parent"]]);
        }
    } else {
        $options[] = $refs[$category["id"]];
    }
    
}

print_r($options);

Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Array ( [Cosmetics] => Array ( [id] => Cosmetics [options] => Array ( ) ) ) Array ( [Cosmetics] => Array ( [id] => Cosmetics [options] => Array ( ) ) [Beauty] => [Makeup] => Array ( [id] => Makeup [options] => Array ( ) ) ) Array ( [Cosmetics] => Array ( [id] => Cosmetics [options] => Array ( [0] => Array ( [id] => Beauty [options] => Array ( ) ) ) ) [Beauty] => Array ( [id] => Beauty [options] => Array ( ) ) [Makeup] => Array ( [id] => Makeup [options] => Array ( ) ) ) Array ( [0] => Array ( [id] => Beauty [options] => Array ( ) ) )

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