Issue with Laravel - str_random()

I have this code to upload image with Laravel:

{
        $article['image']= 'http://nationaluasi.com/dru/content/hotelIcon.png';
        $file = array('image' => $request->file('image'));
        // setting up rules
        $rules = array('image' => 'required',); //mimes:jpeg,bmp,png and for max size max:10000
         // doing the validation, passing post data, rules and the messages
        $validator = Validator::make($file, $rules);
        if ($validator->fails()) {
        // send back to the page with the input data and errors
        $article['image'] = null;

        }
        else {
    // checking file is valid.
        if ($request->file('image')->isValid()) {
        $destinationPath = public_path().'/images'; // upload path
        $extension = $request->file('image')->getClientOriginalExtension(); // getting image extension
         $fileName = str_random(5).'.'.$extension; // renameing image
         $request->file('image')->move($destinationPath, $fileName); // uploading file to given path
         // sending back with message
         $article['image'] = $fileName;

         }
        else {

        }
  }

so everything is fine with image upload but when I see my /public/images folder the image have name: DiYhh.png but in database is stored: /tmp/phpVu3QOa

Why, what is the probem? Why dont store the same name in image column at database (DiYhh.png) instead /tmp/... ???