Question

I have a deep and long array (matrix). I only know the product ID.
How found way to product?

Sample an array of (but as I said, it can be very long and deep):

Array(
        [apple] => Array(
                [new] => Array(
                        [0] => Array([id] => 1)
                        [1] => Array([id] => 2))
                [old] => Array(
                        [0] => Array([id] => 3)
                        [1] => Array([id] => 4))
            )
)

I have id: 3, and i wish get this:
apple, old, 0

Thanks

Answer 1

You can use this baby:

function getById($id,$array,&$keys){
  foreach($array as $key => $value){
     if(is_array( $value )){
        $result = getById($id,$value,$keys);
        if($result == true){
          $keys[] = $key;
          return true;
        }
     }
     else if($key == 'id' && $value == $id){
       $keys[] = $key; // Optional, adds id to the result array
       return true;
     }
  }
  return false;
}
// USAGE:
$result_array = array();
getById( 3, $products, $result_array);
// RESULT (= $result_array)
Array
(
    [0] => id
    [1] => 0
    [2] => old
    [3] => apple
)

The function itself will return true on success and false on error, the data you want to have will be stored in the 3rd parameter.

You can use array_reverse(), link, to reverse the order and array_pop(), link, to remove the last item (‘id’)