$cost_string = file_get_contents("/aws_data/ec2prices.json");
$cost_arr = json_decode($cost_string,true);
$costs_regions = $cost_arr['regions'];
foreach ($costs_regions as $region){
$regions = $region['region'];
$prices = $region['instanceTypes'];
foreach ($prices as $price){

$oldCost_array[] = array('region'=> $region['region'],'type'=>$price['type'],'os'=> $price['os'],'price'=>$price['prices']['ondemand']['hourly'],'new_price'=>'','utilization'=>$price['utilization'],'upfront'=>$price ['prices']['ondemand']['upfront_perGB']);
}
}

$oldCostJson = json_encode($oldCost_array);

$newCostStr = file_get_contents("/aws_data/ec2prices_latest.json");
$newCost_arr = json_decode($newCostStr,true);
$newCost_regions = $newCost_arr['regions'];
foreach($newCost_regions as $newRegion){
$newPrices = $newRegion['instanceTypes'];
foreach ($newPrices as $new_price){
$newCost_array[] = json_decode($oldCostJson,true);
array_push($newCost_array, array('new_price'=>$new_price['price']));

}
}
$newCost = json_encode($newCost_array);