validate image file only when uploaded

Hi
I need to validate an image file only if it was uploaded by the user.
I know I can use something like:

PHP Code:

if(isset($_FILE['image'])){
    validate();
} 


is there any internal validation rule to achieve this?
premit_empty() ignore the whole validation

Hi, we do have an file uploads rules, if that's what you are after?
https://codeigniter.com/user_guide/libra...le-uploads

Or you can write your own:
https://codeigniter.com/user_guide/libra...stom-rules

$image = $this->request->getFile('input_fiee_name');

if($image->isValid)
{
//Your code here
}

$image = $this->request->getFile('input_fiee_name');

if($image->isValid)
{
  //Your code here
}

I'm looking for an internal validation rule like premit_empty but for uploaded files.