core/app/Http/Controllers/Admin/Search.php

<?php

namespace App\Http\Controllers\Admin;

use App\Handlers\Contracts\SearchHandler;
use App\Handlers\Contracts\SearchPresenterHandler;
use App\Handlers\Registrators\SearchEngineRegistrator;
use App\Http\Controllers\Controller;
use App\Http\Requests;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Input;
use Symfony\Component\Process\Exception\InvalidArgumentException;

class Search extends Controller
{
    /**
     * Create form for searching
     *
     * @return $this|\Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function getSearch()
    {
        $results = [];
        $term = Input::get('search');

        if (!is_null($term)) {
            try {
                $results = $this->performSearch($term);
            } catch (InvalidArgumentException $e) {
                // user entered empty string (or something like empty string)
                return redirect()
                    ->route('search')
                    ->with('error', $e->getMessage());
            }
        }

        return view('admin.search.page', ['search' => $term, 'results' => $results]);
    }

    /**
     * Method used for performing search.
     *
     * This method iterates over all registered search engines and returns results for each engine apart.
     *
     * @param string $term search text
     *
     * @return array array of results. One item per each engine
     */
    protected function performSearch($term)
    {
        $engines = App::make('registerSearchEngine')
                      ->get(SearchEngineRegistrator::ADMIN);

        $resultsParts = [];
        foreach ($engines as $engine) {
            /**
             * @var SearchHandler          $search
             * @var SearchPresenterHandler $presenter
             */

            list ($search, $presenter) = $engine;

            // try to find given term
            $results = $search->search($term);

            // create result object
            $resultsParts[$search->getId()] = [
                'name'    => $search->getName(),
                'content' => $presenter->render($results),
                'count'   => count($results)
            ];
        }

        return $resultsParts;
    }
}