Validation\Validator\File

use Phalcon\Validation\Validator\File as FileValidator;

 $validator->add('file', new FileValidator([
     'maxSize' => '2M',
     'messageSize' => ':field exceeds the max filesize (:max)',
     'allowedTypes' => array('image/jpeg', 'image/png'),
     'messageType' => 'Allowed file types are :types',
     'maxResolution' => '800x600',
     'messageMaxResolution' => 'Max resolution of :field is :max'
 ]));

 $validator->add(['file', 'anotherFile'], new FileValidator([
     'maxSize' => [
         'file' => '2M',
         'anotherFile' => '4M'
     ],
     'messageSize' => [
         'file' => 'file exceeds the max filesize 2M',
         'anotherFile' => 'anotherFile exceeds the max filesize 4M',
     'allowedTypes' => [
         'file' => ['image/jpeg', 'image/png'],
         'anotherFile' => ['image/gif', 'image/bmp']
     ],
     'messageType' => [
         'file' => 'Allowed file types are image/jpeg and image/png',
         'anotherFile' => 'Allowed file types are image/gif and image/bmp'
     ],
     'maxResolution' => [
         'file' => '800x600',
         'anotherFile' => '1024x768'
     ],
     'messageMaxResolution' => [
         'file' => 'Max resolution of file is 800x600',
         'anotherFile' => 'Max resolution of file is 1024x768'
     ]
 ]));