laravel update app !!!

<?php
// ...
Route::get('/update', function(){
    // define some vars
    $base = __DIR__.'/../';
    $temp_path = $base . 'storage/tmp';
    $controller_path = $base . 'app/Http/Controllers';
    $routes_path = $base . 'routes/';
    $routes_file = $routes_path . 'web.php';
    $home_controller = 'HomeController.php'; // update existing file
    $test_controller = 'TestController.php'; // will add new file

    // make tmp dir to download
    if ( ! file_exists($temp_path)) {
        mkdir($temp_path);
    }

    // keep backup ?!!
    $files_to_backup = [
        $controller_path . '/' . $home_controller,
        // some how list all files
    ];
    foreach ($files_to_backup as $file) {
        if( file_exists($file) )
            rename($file, $file.'.bk'); // move some where else??!!
    }

    // download update
    $fp = fopen ($temp_path . '/update.tmp', 'w+');
    $url = 'http://localhost/HomeController.php.txt';

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_TIMEOUT, 50);
    curl_setopt($ch, CURLOPT_FILE, $fp);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_exec($ch);
    curl_close($ch);
    fclose($fp);

    // override existing
    rename($temp_path.'/update.tmp', $controller_path . '/' . $home_controller);

    // add new file
    // assume that you have downloaded this file also
    // :P too lazy to make new file just for test
    $content = '<?php
        namespace App\Http\Controllers;

        class TestController extends Controller
        {
            public function index()
            {
                return view("welcome");
            }
        }';

    file_put_contents($controller_path . '/' . $test_controller, $content);

    // update routes
    $data = file_get_contents($routes_file);
    $data .= "
        Route::get('/test', 'TestController@index');
    "; // all the new routes :p

    file_put_contents($routes_file, $data);

    echo 'all done';
});