rules multiple uploads

The form (view)

Code:

<form method="post">
    <input type="text" name="id_cat[1]" />
    <input type="text" name="id_cat[2]" />
    <input type="text" name="id_cat[3]" />
    <br><br>
    <input type="submit" value="Submit">
</form>

The validation (controller)

PHP Code:

$rules = [
    'id_cat.1' => 'numeric',
    'id_cat.2' => 'numeric',
    'id_cat.3' => 'numeric'
];

if (! $this->validate($rules))
{
    print_r('error');
}
else
{
    print_r('success');
} 


Could this be a solution ?