First php class and object usage

gistfile1.txt

class Person {
	public $teacher;
	public $student;
	public $age;
	
	function displayStudentNameandTeacher() {
		echo 'My Name is ' . $this->student . ' my teacher is ' . $this->teacher . '. My teachers age is ' . $this->getAge() . '.'; 
	}
	function setAge($var) {
		$this->age = $var;
	}
	function getAge() {
		return $this->age;
	}
}

$obj1 = new Person();
$obj1->setAge(25);
$obj1->teacher = "Mrs Williams";
$obj1->student = "Alex Bennett";

$obj1->displayStudentNameandTeacher();