Demonstrate the use of Functions as you see in the followingimage.

Make sure to add more Functions for Subtract, Multiply andDivide and then add the corresponding case statements.
Part II Chapter 14 – Class
- Start a new project and create a simple html document that hasa simple form. You can give this document any name you want.
- Begin a new php document that creates a simple class and allthe related function.
- Finally create a response php document that creates an objectbased on the class
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