如何修复PHP / Laravel中的文件/图像更新问题

Question

When I'am updating image/file database doesn't save path but only temporary path that looks like "C:\xampp\tmp\php4831.tmp". It's must be saved in database like"C:\xampp\htdocs\advertisment\public\public/ad_imag..." I use PHP and Laravel 5.7.Here is part of code of my update method in controller.

 $car = Car::find($id); // finding'id' of subject

 $car->name = $request->name;
 if($file = $request->hasFile('car_photo')) {
 unlink($car->car_photo); //deletes previous file

            }
     //uploads new file
     $request->file('car_photo')->move(public_path('public/ad_images'), 
     $request->file('car_photo')->getClientOriginalName());

     try {   
Car::find($id)->update($request->all());

           dd($car);


 return response()->json(
     Json::construct 
        'Resource updated succesfully',                  
              201,
              ['car' => $data]
             ),
             201
          );
          ......
          ...    

The problem is record in database which is like: C:\xampp\tmp\php4831.tmp, but it needs to be like: C:\xampp\htdocs\advertisment\public\public/ad_images.

Thanks in advance for help.