Answer the following Question :
Ask the user to enter a file name for opening (the user expects the file to be on the server).
Display the contents of the file if it is on the server or the message "File not found." if it is not found. Then ask the user to enter a number between 33 and 77 inclusive.
Use PHP filters to ensure the number entered is within the range. Use try, throw, and catch to handle the case if the number is outside of the range.