This illustration show a piece of code of the Employee class. The code is the following:
function getAllEmployees(){
    $emp1 = new Employee();
    $emp1 ->id ="E001";
    $emp1 ->firstName = "Sam";
    $emp1 ->lastName ="Smith";
    $emp1 ->department ="Sales";
    $emp1 ->mobile="+1767898999";
The firstName and lastName properties are highlighted because those properties were updated.