function createPHPClassesFromJS()
{
    $firefighter = Firefighter::getFirefighterFromJSON(getFirefighterJSJson());
    $timeslot = Timeslot::getTimeslotFromJSON(getTimeslotJSJson());
    $scheduleTimeslot = ScheduleTimeslot::getScheduleTimeslotFromJSON(getScheduleTimeslotJSJson());
    $content = "" . ("Old JSON <br>" . getFirefighterJSJson() . "<br><br>") . ("To PHP JSON: <br>" . $firefighter->getJSON() . "<br><br>") . ("Old JSON <br>" . getTimeslotJSJson() . "<br><br>") . ("To PHP JSON: <br>" . $timeslot->getJSON() . "<br><br>") . ("Old JSON: <br>" . getScheduleTimeslotJSJson() . "<br><br>") . ("To PHP JSON: <br>" . $scheduleTimeslot->getJSON() . "<br><br>");
    return $content;
}