<?php class Person { public $ID = -1; public $FirstName = ''; public $LastName = ''; public $WeightInKilograms = 0.0; public $HeightInMeters = 0.0; private $_birthDate = ''; //setters and getter for BirthDate public function getBirthDate() { return $this->_birthDate; } public function setBirthDate($value) { $this->_birthDate = $value; } }