if (sizeof($usersAddedArray) > 0) {
     $weekHours = $groupInfo['hours'];
     //update user table with current active weekly hours
     if (groupHasCurWeekHours($groupInfo)) {
         $curWeekUpdateQuery = "UPDATE User SET curWeekHrs = curWeekHrs + {$weekHours} WHERE {$curWeekUpdateString}";
         $curWeekUpdateStmt = $db->prepare($curWeekUpdateQuery);
         $curWeekUpdateStmt->execute($usersAddedArray);
     }
     //update user table with active weekly hours for next week
     if (groupHasNextWeekHours($groupInfo)) {
         $nextWeekUpdateQuery = "UPDATE User SET nextWeekHrs = nextWeekHrs + {$weekHours} WHERE {$nextWeekUpdateString}";
         $nextWeekUpdateStmt = $db->prepare($nextWeekUpdateQuery);
         $nextWeekUpdateStmt->execute($usersAddedArray);
     }
     //update user table with active weekly hours for next week
     if (groupHasThirdWeekHours($groupInfo)) {
         $thirdWeekUpdateQuery = "UPDATE User SET thirdWeekHrs = thirdWeekHrs + {$weekHours} WHERE {$nextWeekUpdateString}";
         $thirdWeekUpdateStmt = $db->prepare($thirdWeekUpdateQuery);
         $thirdWeekUpdateStmt->execute($usersAddedArray);
     }
     if (strcmp($groupInfo['hasBookingDurationRestriction'], 'No') == 0) {
         $restUpdateQuery = "UPDATE User SET hasBookingDurationRestriction = 'No' WHERE {$restUpdateString}";
         $restUpdateStmt = $db->prepare($restUpdateQuery);
         $restUpdateStmt->execute($usersAddedArray);
     }
 }
 $db->commit();
 $result = array();
 $result["addedUsers"] = $usersAddedArray;
 $result["usersAlreadyInGroup"] = $alreadyInGroupArray;
 $result["usersNotInMaster"] = $notInMasterArray;
function maybeUpdateUserHours($db, $uID, $groupInfo)
{
    if (groupHasCurWeekHours($groupInfo) || groupHasNextWeekHours($groupInfo) || groupHasThirdWeekHours($groupInfo)) {
        //get user's hours
        $hrsQuery = "SELECT curWeekHrs, nextWeekHrs, thirdWeekHrs FROM User WHERE uID = ?";
        $hrsStmt = $db->prepare($hrsQuery);
        $hrsStmt->execute(array($uID));
        $hrs = $hrsStmt->fetch(PDO::FETCH_ASSOC);
        // calculate new user hours. subtract group hours from the hours they have.
        // can't be less than 0.
        $newCurHrs = max($hrs['curWeekHrs'] - $groupInfo['hours'], 0);
        $newNextHrs = max($hrs['nextWeekHrs'] - $groupInfo['hours'], 0);
        $newThirdHrs = max($hrs['thirdWeekHrs'] - $groupInfo['hours'], 0);
        //decrement user's hours
        if (groupHasCurWeekHours($groupInfo)) {
            $curWeekUpdateQuery = "UPDATE User SET curWeekHrs = {$newCurHrs} WHERE uID= ?";
            $curWeekUpdateStmt = $db->prepare($curWeekUpdateQuery);
            $curWeekUpdateStmt->execute(array($uID));
        }
        if (groupHasNextWeekHours($groupInfo)) {
            $nextWeekUpdateQuery = "UPDATE User SET nextWeekHrs = {$newNextHrs} WHERE uID= ?";
            $nextWeekUpdateStmt = $db->prepare($nextWeekUpdateQuery);
            $nextWeekUpdateStmt->execute(array($uID));
        }
        if (groupHasThirdWeekHours($groupInfo)) {
            $thirdWeekUpdateQuery = "UPDATE User SET thirdWeekHrs = {$newThirdHrs} WHERE uID= ?";
            $thirdWeekUpdateStmt = $db->prepare($thirdWeekUpdateQuery);
            $thirdWeekUpdateStmt->execute(array($uID));
        }
    }
}