File upload validation with same name

Hi, 

I try upload file with same name.


my code:

PHP Code:

$validation = \Config\Services::validation();

$validation->setRules([
     'files[]' => 'mime_in[files[],image/jpeg,image/pjpeg,image/png]'
]); 


And I get error this:
CRITICAL - 2019-01-23 15:57:24 --> Argument 1 passed to CodeIgniter\Validation\FileRules::mime_in() must be of the type string or null, array given, called in

So.. how to upload files with validations and same names