Encapsulation: PHP means, enclosing the internal details of the object to protect from external sources. It describes, combining the class, data variables and member functions that work on data together within a single unit to form an object. PHP program for encapsulation: The methods or functions in the following program are update password and check the course name. user class defines all the operations related to users. Output: Function to update password ‘abhi2’ for user user1Function to check course name