Laravel Eloquent where and order conditions only if needed

Please look at following code. This code I have written with Codeigniter. What I need to highlight it where condition and order conditions works only if those post requests are set. Otherwise it i just select * from student.

Codeigniter Code

$this->db->select('*');
$this->db->from('student');
if($this->input->post('first_name') != NULL){
    $first_name = $this->input->post('first_name');
    $this->db->where('first_name', $first_name);
}

if($this->input->post('last_name') != NULL){
    $last_name= $this->input->post('last_name');
    $this->db->where('last_name', $last_name);
}

if($this->input->post('order_by') != NULL){
    $order_by= $this->input->post('order_by');
    $this->db->order_by($order_by);
}

$query = $this->db->get();

Laravel Code

I am going do the same thing with laravel.

$first_name = $request->input('first_name');
$last_name = $request->input('last_name');
$order_by = $request->input('$order_by');

$students = Student::orderBy($order_by)
      ->where('first_name',$first_name)
      ->where('last_name',$last_name);
      ->paginate(10);

I able to run above code. The code works when there all post requests.

But if there is no first_name post request I need to remove ->where('first_name',$first_name).

If there i no order_by post request, I need to remove orderBy($order_by).

How to do it with above Laravel code.

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