[PHP] oop problems code

[ORLANDO POZO]

Hello, mailing list, I have problem with this oop code:

<?

class Person {
  var $name, $address, $age;
  function Person($name, $address, $age) {
    $this->name = $name;
    $this->address = $address;
    $this->age = $age;
  }
}
Class Employee extends Person {
  var $position, $salary;
  function Employee($name, $address, $age, $position, 
$salary) {
    $this->Person($name, $address, $age);
    $this->position = $position;
    $this->salary = $salary;
  }
}

Class Displayer extends Employee {
 function DisplayEmployee() {
  echo "Name: " . $this->name . "<br>";
  echo "Address: " . $this->address . "<br>";
  echo "Age: " . $this->age . "<br>";
  echo "Position: " . $this->position . "<br>";
  echo "Salary: " . $this->salary . "<br>";
 }
}
$obj1 = new Employee("Orlando J Pozo P","Calle 75 AV 
9B-10","20","Computer Engineer","$2000");
$obj2 = new Displayer;
$obj2->DisplayEmployee();

?>

----------------------------------------------------------------------------------------------
the output of it is:
Warning: Missing argument 1 for employee() in 
C:\htdocs\ojpp\poo\3\practica\Copy of 18.php on line 16

Warning: Missing argument 2 for employee() in 
C:\htdocs\ojpp\poo\3\practica\Copy of 18.php on line 16

Warning: Missing argument 3 for employee() in 
C:\htdocs\ojpp\poo\3\practica\Copy of 18.php on line 16

Warning: Missing argument 4 for employee() in 
C:\htdocs\ojpp\poo\3\practica\Copy of 18.php on line 16

Warning: Missing argument 5 for employee() in 
C:\htdocs\ojpp\poo\3\practica\Copy of 18.php on line 16
Name: 
Address: 
Age: 
Position: 
Salary: 

----------------------------------------------------------------------------------------------

  I don't know what happen in this code, because, the 
last inheritance (Displayer Class) that I made, it is 
inherited the properties and methods of the Employee 
Class, and as Employee Class is also inherited the 
functionality of the parent class, the Displayer Class 
would be inherit this functionality, too.

  thanks if any could help me, regards, bye.

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