Write, test, and debug (if necessary) PHP scripts for the specifications that follow write functions and the code to test them. 1. Parameter: An array of strings. Return value: A list of the unique...

Write, test, and debug (if necessary) PHP scripts for the specifications that follow write functions and the code to test them.

1.  Parameter: An array of strings. Return value: A list of the unique strings in the parameter array.

2. Parameter: An array of numbers. Return value: The average and median of the parameter array.

3. Parameter: An array of strings. Return value: A list of the three strings that occur most frequently in the parameter array