In the folder create a web page using PHP, HTML5 and CSS with the following:
A function with two required and two defaulted parameters.
A function with two parameters passed by value and two parameters passed by reference.
The functions must output the arguments of a call to each function. Ensure that the differences between calling the functions with/without defaulted parameters and with parameters passed by value and reference are clearly identifiable in the output.
An object with at least three properties, get and set methods for each property and a method that combines (by concatenation or numeric expression) the properties.
Instantiate two instances of the object and output the properties of each instance through the get methods and the combination of the properties.