Create a Web form to help in creating $$Jumble$$ puzzles.

Create a form that has four input fields named Word$1,$ Word$2,$ Word$3,$ and Word$4,$ as well as $$Reset$$ and $$Submit$$ buttons. Create a form processing script that verifies that all four words are entered, that all of them contain only letters, and that all four are between $4$ and $7$ characters long. Once all of the words have been verified as correct, use the strtoupper$()$ and str$\_$shuffle$()$ functions to produce four jumbled sets of letters.