Update function with Image Replace while update

I created a Lumen code to store data with 5 images (took the manual image method ) and that API is working fine. I have a doubt if I want to update the query I can update all the part of data but have no clue with images.

I tried update images names but the same problem is how do I replace images

   public function store(Request $request)
    {
        $post = new Post;
        $post->setConnection('mysql1');
        $user= User::where('token', $request->token)->first();

          if ($user) {
          $a = Auth::user()->id;
          $post =  Auth::user()->posts()->create([
                'post_id' => rand(),
                'title' => $request->title,
                'cooked_time' => $request->cooked_time,
                'user_id' => Auth::id(),
            ]);

            if (!function_exists('public_path')) {

                function public_path($path = null) {
                    return rtrim(app()->basePath('public/' . $path) , '/');
                }
            }
            $images = new PostImage;
            $destination_path = public_path('/images');

            if ($request->hasFile('image1')) {

                $image1 = $request->file('image1');
                $image_size1 = $image1->getClientSize();
                $image_ext1 = $image1->getClientOriginalExtension();
                $new_image_name1 = rand(123456, 99999999) . "." . $image_ext1;
                $image1->move($destination_path, $new_image_name1);
                $images->image_name1 = $new_image_name1;
            }
            if ($request->hasFile('image2')) {
                $image2 = $request->file('image2');
                $image_size2 = $image2->getClientSize();
                $image_ext2 = $image2->getClientOriginalExtension();
                $new_image_name2 = rand(123456, 99999999) . "." . $image_ext2;
                $image2->move($destination_path, $new_image_name2);
                $images->image_name2 = $new_image_name2;
            }
            if ($request->hasFile('image3')) {

                $image3 = $request->file('image3');
                $image_size3 = $image3->getClientSize();
                $image_ext3 = $image3->getClientOriginalExtension();
                $new_image_name3 = rand(123456, 99999999) . "." . $image_ext3;
                $image3->move($destination_path, $new_image_name3);
                $images->image_name3 = $new_image_name3;
            }
            if ($request->hasFile('image4')) {
                $image4 = $request->file('image4');
                $image_size4 = $image4->getClientSize();
                $image_ext4 = $image4->getClientOriginalExtension();
                $new_image_name4 = rand(123456, 99999999) . "." . $image_ext4;
                $image4->move($destination_path, $new_image_name4);
                $images->image_name4 = $new_image_name4;
            }
            if ($request->hasFile('image5')) {
                $image5 = $request->file('image5');
                $image_size5 = $image5->getClientSize();
                $image_ext5 = $image5->getClientOriginalExtension();
                $new_image_name5 = rand(123456, 99999999) . "." . $image_ext5;
                $image5->move($destination_path, $new_image_name5);
                $images->image_name5 = $new_image_name5;
            }       

                $images->post_id = $post->post_id;
                $images->save();

            return response()->json(['message' => 'success', 'user' => $user['name'], 'post' => $post, 'images' => $images,], 200);
            }   
    }

I want the images that are stored to be replaced if I am updating the request and this is how i Updated my code

public function update(Request $request, $post_id)
    {
        $posts = Post::findorFail($post_id);
        // dd($posts);
        if (Auth::user()->id !== $posts->user_id) {
            return response()->json(['status'=> 'error', 'message' => 'unauthorized'], 401);
        }
        $post1=$request->all();

        $posts->fill($post1)->save();

        return response()->json(['status' => 'success', 'updated_post' => $posts,], 200);
    }

How do i update my images and replace that are placed in Folder

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