Write a php page that uses an associative array to populate a drop-down select with
grades and corresponding weights (A is 4.000, A- is 3.667, B+ is 3.333, etc.)
Write a HTML request and PHP response page that validates a URL entered by the user. Also write
a regular expression for a classroom number having the format like H-155 (that is a capital letter, followed by a dash, followed
by 2 to 3 digits. Then have the user enter a room number and validate it.