Form Validation, multiple "different" rules

Hey everyone,

I've got a form that will have multiple email addresses and they should all be unique. I'm aware I have access to the "different" rule that comes with Laravel:

different:*field*

The field under validation must have a different value than *field*.

http://laravel.com/docs/5.1/validation#rule-different

My issue is that I'm unsure how I should write the rule for each email field using the different rule to apply to all the other email fields. My first guess is a double for loop? So let's say I have 8 email fields, all named sequentially email[1], email[2] etc, I'd do something like this:

for ($i = 1; $i < 8; $i++) {

    for ($j = 1; $j < 8; $i++) {

        if ($j !== $i) {
            $rules['email.' . $i] .= '|different:email.' . $j;
        }

    }

}

So, if anyone could provide some guidance on the best way to do this I'd highly appreciate it.

Another issue I'm confused about is should I use the actual value of the input or can I simply reference the input name? So instead of:

$rules['email.' . $i] .= '|different:email.' . $j;

I would put:

$rules['email.' . $i] .= '|different:' . \Input::get('email.' . $j;