PHP error. Why is “variable undefined” inside array_map?

Question

I am using array_map function in my php application. I defined the array_map function like this.

$ratingID =  $this->db->insert_id();

    $r         


        

Answer 1

$rated_item_array = array_map(
  function ($a) use ($ratingID){ 
    return $a + array('RatingID' => $ratingID ); 
  }, 
  $rated_item_array
);