Operations on 2 no.s using php. Take input from HTML form. Web technology/ php/IP practical

Write a script to accept two integers(Use html form having 2 textboxes). Write a PHP script to, a. Find mod of the two numbers. b. Find the power of first number raised to the second. c. Find the sum of first n numbers (considering first number as n) d. Find the factorial of second number. (Write separate function for each of the above operations.)