php #1

write, test and debug (of necessary) PHP scripts for the specifications that follow. For exercise 1 through 7, 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 numbers in 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.

4 parameter:  an array of numbers (pass by value) and two arrays (pass by reference)

return value: None

Result: The first pass by reference parameter must have the values of the given array that are greater than zero; the second must have the values that are less than zero.