How to generate a PHP query to update data in mongoDB with conditions?

Question

PHP

Hello,
I "stopped" writing this query:

The query increases the value of the 'countOperation' field and, based on the
new value of 'countOperation', it is necessary to calculate the 'sum' field

PHP 7.3
mongoDB 4.4.6

$id="123";
  $clientName="Alex Petrov";
  $price1=10;
  $price2=11;
  $price3=12;
  $price4=13;

  $res= $db->collection->findOneAndUpdate(
    array('_id'=>$id),
    array(
      '$inc' => array('countOperations'=>1),
      '$setOnInsert' => array(
        'clientname'=>$clientName
      ),
      '$set' => array(
        'sum'=>array(
      
          // псевдокод begin
          if('countOperations'>1 && 'countOperations'<=10)
          {	'sum'='countOperations'*$price1;
          }					
          else
          if('countOperations'>10 && 'countOperations'<=20)
          {	'sum'='countOperations'*$price2;
          }					
          else
          if('countOperations'>20 && 'countOperations'<=30)
          {	'sum'='countOperations'*$price3;
          }					
          else
          {	'sum'='countOperations'*$price4;
          }					
        
          // как вариант можно использовать 
          // switch()
          // {	case: then:
          // 		defaul:
          // }
          
          // псевдокод end 
        )
      )
    ),
    array('upsert'=>true)
  );