public function doctorToArray(Doctor $doctor)
{
$arr = array('id' => $doctor->getId(), 'name' => "{$doctor->getFirstName()} {$doctor->getMiddleName()} {$doctor->getLastName()}", 'medicalCenters' => array());
foreach ($doctor->getMedicalCenters() as $dmc) {
$arr['medicalCenters'][$dmc->getId()] = $dmc->getName();
}
return $arr;
}
