Building a TODO list in PHP

When (S)ave is chosen, the user should be able to enter the path to a
file to have it save. Use fwrite() with the mode that starts at the
beginning of a file and removes all the file contents, or creates a new
one if it does not exist. After save, alert the user the save was
successful and redisplay the list and main menu.
Building a TODO list in PHP

reflection of changes in todo_list.php