Recursive array_search

Question

I have a multi-dimensional array:

$categories = array(
    array(
        \'CategoryID\' => 14308,
        \'CategoryLevel\' => 1,
        \'CategoryNa         


        

Answer 1

public static function unique(array $data, $key){
    $rez = [];
    foreach($data as $val){
        if(!isset($val[$key]) && is_array($val)){
            return self::unique($val, $key);
        }elseif( isset($val[$key]) ){
            $rez[] = $val[$key];
        }
    }
    return array_unique($rez);
}