Build dynamic filter controls in Laravel - https://simplestweb.in/blog/dynamic-filter-controls-laravel

controller.php

public function index(Request $request)
{
    $sortBy = 'id';
    $orderBy = 'desc';
    $perPage = 20;
    $q = null;

    if ($request->has('orderBy')) $orderBy = $request->query('orderBy');
    if ($request->has('sortBy')) $sortBy = $request->query('sortBy');
    if ($request->has('perPage')) $perPage = $request->query('perPage');
    if ($request->has('q')) $q = $request->query('q');

    $users = User::search($q)->orderBy($sortBy, $orderBy)->paginate($perPage);
    return view('users.index', compact('users', 'orderBy', 'sortBy', 'q', 'perPage'));
}

index.blade.php

<form action="{{ route('users.index') }}">
  <div class="row">
    <div class="col-md-4">
      <input class="form-control form-control-sm" type="search" name="q" value="{{ $q }}">
    </div>

    <div class="col-md-2 col-3">
      <select name="sortBy" class="form-control form-control-sm" value="{{ $sortBy }}">
        @foreach(['id', 'name', 'email', 'notes'] as $col)
          <option @if($col == $sortBy) selected @endif value="{{ $col }}">{{ ucfirst($col) }}</option>
        @endforeach
      </select>
    </div>

    <div class="col-md-2 col-3">
      <select name="orderBy" class="form-control form-control-sm" value="{{ $orderBy }}">
        @foreach(['asc', 'desc'] as $order)
          <option @if($order == $orderBy) selected @endif value="{{ $order }}">{{ ucfirst($order) }}</option>
        @endforeach
      </select>
    </div>

    <div class="col-md-2 col-3">
      <select name="perPage" class="form-control form-control-sm" value="{{ $perPage }}">
        @foreach(['20','50','100','250'] as $page)
          <option @if($page == $perPage) selected @endif value="{{ $page }}">{{ $page }}</option>
        @endforeach
      </select>
    </div>

    <div class="col-md-2 col-3">
      <button type="submit" class="w-100 btn btn-sm bg-blue">Filter</button>
    </div>
  </div>
</form>

model.php

public function scopeSearch($query, $q)
{
    if ($q == null) return $query;
    return $query
            ->where('name', 'LIKE', "%{$q}%")
            ->orWhere('email', 'LIKE', "%{$q}%")
            ->orWhere('website', 'LIKE', "%{$q}%")
            ->orWhere('twitter', 'LIKE', "%{$q}%")
            ->orWhere('notes', 'LIKE', "%{$q}%");
}