{{ Form::open(['route' => 'admin.users.search', 'method' => 'get', 'class' => 'navbar-form navbar-left form-inline', 'role' => 'search']) }}

<div class="form-group">
    {{ Form::text('user_id', request('user_id'), ['class' => 'form-control', 'size' => '8', 'placeholder' => 'ID']) }}
</div>


<div class="form-group">
    {{ Form::email('email', request('email'), ['class' => 'form-control', 'size' => '20', 'placeholder' => 'Email']) }}
</div>

<div class="form-group">
    {{ Form::text('first_name', request('first_name'), ['class' => 'form-control', 'size' => '20', 'placeholder' => 'First Name']) }}
</div>

<div class="form-group">
    {{ Form::text('family_name', request('family_name'), ['class' => 'form-control', 'size' => '20', 'placeholder' => 'Family Name']) }}
</div>

<div class="form-group">
    <div class="selectize-lg">
        {{ Form::select('institution_id', $institutions, request('institution_id'), ['class' => 'form-control', 'size' => '200', 'data-selectize']) }}
    </div>
</div>

<div class="form-group">
    <div class="selectize-lg">
        {{ Form::select('exam_id', $exams, request('exam_id'), ['class' => 'form-control', 'data-selectize']) }}
    </div>
</div>

<div class="form-group  ">
    {{ Form::submit('Search', ['class' => 'btn btn-default']) }}
</div>

<a href="{{ route('admin.users.index') }}" class="btn btn-warning">Clear</a>

{{ Form::close() }}

Route::get('members/search', 'UsersController@search')->name('admin.users.search');

$users = User::with('exam', 'institution');


    if ($request->has('user_id')) {
        $users->whereId($request->user_id);
    }

    if ($request->has('email')) {
        $users->whereEmail($request->email);
    }

    if ($request->has('first_name')) {
        $users->where('first_name', 'LIKE', "%{$request->first_name}%");
    }

    if ($request->has('family_name')) {
        $users->where('family_name', 'LIKE', "%{$request->family_name}%");
    }

    if ($request->has('institution_id')) {
        $users->whereInstitutionId($request->institution_id);
    }

    if ($request->has('exam_id')) {
        $users->whereExamId($request->exam_id);
    }

    $users = $users->latest()->paginate(48);
    $usersTotal = $users->total();

    $exams = ['' => 'Exam...'] + Exam::orderBy('title')
        ->pluck('title', 'id')
        ->all();

    $institutions = ['' => 'University...'] + Institution::orderBy('name')
        ->pluck('name', 'id')
        ->all();

    return view('admin.users.index', compact('users', 'usersTotal', 'exams', 'institutions'));

{{ $users->appends(array_filter(request()->except('page')))->render() }}

search?user_id=&email=hello%40world&first_name=John&family_name=Smith&institution_id=1&exam_id=1

search?page=2