keys in forms

Thanks in advance for your time. If possible, how may I syntactically include a key name (instead of just [] or [2]) in an HTML form that will pass an array value? What if I would like to pass a complex array? <input type=text name="manual['first']['subOfFirst']"> Example: <input type=text name="manual['first']"> If the example is correct, please respond, so I can look elsewhere for the problem. Respectfully, RW