PHP OOPS - Polymorphism

What is Polymorphism?
Polymorphism in PHP5 is a technique where the function to be called is detected based on the class object calling it at runtime. The basis of Polymorphism is Inheritance and function overridden.


Example – Basic Polymorphism


class BaseClass
{
public function myMethod()
{
echo "BaseClass method called";
}
}

class DerivedClass extends BaseClass
{
public function myMethod()
{
echo "DerivedClass method called";
}
}

function processClass(BaseClass $c)
{
$c->myMethod();
}

$c = new DerivedClass();
processClass($c);

Output:
DerivedClass method called

Here i am declaring BaseClass and DerivedClass but i am calling the the processClass with the Derived Class Object.