How to get recursion correctly?

Question

PHP

I have a multidimensional array and I want to receive data regardless of nesting level.
example I need to get data by id.

public function getChildById($arr, $id) {
    if(is_array($arr)){
      foreach ($arr as $key => $value) {
        if($value['_id'] == $id){
          return $value;
        }else {
          if($this -> getChildById($value['childs'], $id) != null){
            print_r(1);
            return $arr[$key]['childs'][0];
          }
        }
      }
    }
    return  false;
  }

but I get maximum second level data.
how to solve it. thank.

Answer 1

if($this->getChildById($value['childs'], $id) != null){
    print_r(1);
    return $arr[$key]['childs'][0];
}

change to

if ($r = $this->getChildById($value['childs'], $id) !== false) {
    return $r;
}