public $age = 10;
$man = new person();
Here, the class name is person and an object named man .. and the object is mentioned as a person.. that is the man object have all the characteristics that the class person contain.
Explaining class we can say , classes are group of objects. In the above example the class person can be a man or woman with some specific characteristics like age,height,face color etc. And each specific man is an object . that is i am an object i have age,height, face color
you can notice that i display the age outside of the class just for an example but its better to display such types into a function or method inside the class.