helping someone in laravelph

monitoring.php

// Route
Route::get('/monitoring/{username}', 'MainCtr@monitoringView')->middleware('admin');

// Controller
public function monitoringView($username = null)
{
    if (!is_null($username) || isset($username)) {
        $data = Users::whereUsername($username)->first();
    } elseif (request()->has('monitoring')) {
        $data = ServiceRequest::where('status', request('monitoring'))
            ->paginate(2)
            ->appends('monitoring', request('monitoring'));
    } else {
        $data = ServiceRequest::paginate(10);
    }

    return $view('page.monitoring')->with('data', $data);
}

// View 
<div class="panel-body">
  <form>
    <a href="/monitoring" class="btn btn-info">View All</a>
    <a href="/monitoring?monitoring=2" class="btn btn-warning">View Pending</a>
    <a href="/monitoring?monitoring=1" class="btn btn-success">View Completed</a>
    <a href="/monitoring" class="btn btn-default">Sort Date</a>
  </form>
  <h3>{{ $data->total() }} total requests</h3>
  <h3>{{ $user->username() }}</h3>
</div>