gistfile1.txt

<?php
use MyModel;
class ExampleClass {
   public static function sumMyData(){
       $sum = 0;
       $myIdsArray = []; 
       $myIdsArray = MyModel::getMyListOfIdsFromDb();
       $collection = MyModel::getCollection($myIdsArray);
       foreach($object in $collection){
           $sum = sum + $object->value;
       }
       return sum;         
   }
}