The following set of short questions will focus on getting you familiar with how to write php functions as well as how to make use of the pre-existing php functions. all your php functions must be declared in the document body section and each functions name must be as specified below. to demonstrate the functionality of each method, you must make function calls in the document body. include a heading (hl.. h6) that indicates which function is being tested before each function demonstration. the use of global variables is forbidden! test all your functions with some relevant input parameter values.

Write a method public static string getdigits(string phonenumber) that takes an 11-character phone number written with any combination of 11 uppercase letters, lowercase letters and/or digits, and zero or more hyphens, and which returns the digits that a person would have to press on a cell phone to dial that phone number. we will use the mapping of letters to digits given at en. wikipedia. org/wiki/telephone_keypad# /media/file: telephone-keypad2.svg you may assume that the string parameter phonenumber contains some combination of exactly 11 uppercase letters, lowercase letters and/or digits, but that any number of hyphens may be present. you can assume that a hyphen will not appear as the first or last character of the string. do not assum