How to make the correct formation of a php array?

Question

PHP

Hello. I form an array in PHP in this way:

<?php
  $massiv = array();
  
  foreach($deliveries as $delivery){
    $massiv[] = array(
      "type"=>"Feature", 
      "id" => $delivery->id,
      "geometry" => array(
        "type" => "Polygon",
        "coordinates" => $delivery->map
      )
    );
  };
  
  $result = array("type" => "FeatureCollection","features" => $massiv);
  echo json_encode( $result );
?>

But in the output, the id value and the coordinates value are enclosed in quotes. Those. instead of the right one: "id":12it turns out "id":"12"
Tell me how to exclude quotes from the id and coordinates values?
Currently outputting:

{"type":"FeatureCollection","features":[{"type":"Feature","id":"12","geometry":{"type":"Polygon","coordinates":"[]"}},{"type":"Feature","id":"13","geometry":{"type":"Polygon","coordinates":"[]"}}]}

Answer 1

"id" => (int)($delivery->id),