spy30/app/Http/Controllers/SlideshowController.php

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
use App\Tweet, App\Team;

class SlideshowController extends Controller
{

  public function slideshow() {

    $photos = [];

    $tweets = Tweet::where('processed', 1)->orderByRaw('RAND()')->get();
    foreach($tweets as $tweet) {
      if($tweet->photo) {
        foreach(json_decode($tweet->photo) as $photo) {
          $photos[] = [
            'img' => $photo,
            'description' => $tweet->team->name . ' Team: ' . $tweet->text
          ];
        }
      }
    }

    return view('slideshow', [
      'photos' => $photos
    ]);
  }

}