Hello Reader's if you are developing the website and you want to restrict file upload to max of 4 then you can use the code as below:-

The logic for this condition is you just have to return false is count of array is more than 4. Let's see how is it done:-

On the HTML

<input type="file" multiple="multiple" name="something[]" />

Now make the validation like this:-

   if(empty($_FILES['something']['name'][0]))
    {
         //checking whether a single file uploaded or not
         //if enters here means no file uploaded
         //so if you want you may put a check/validation here to make file
         //upload a must in your website
    }
    if(isset($_FILES['something']['name'][4]))
    {
         //checking whether 5 files uploaded or not
         //so here you can put a check/validation to restrict user from
         //uploading more than 4 files
    }