Laravel form validation rules: required, present, filled and nullable

Three concepts

---

Before explaining these four validation rules, need to clarify the concept of three - null (empty), the input data (input data), the verification field (filed under validation).

Null

In Laravel, one of the fields meets any of the following will be considered null values:

• null.
• An empty string ' '.
• Empty array [ ]or an empty countableobject.
• No path to upload files.

& Verification field data input

Registered function, for example:

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

public function register(Request $request)
{
     $this->validator($request->all())->validator;
}

public function validator(array $data)
{
      return Validator::make($data, [
              'name' => 'required|string|max:255',
              'email' => 'required|string|unique:users|email|max:255',
              'password' => 'required|string|min:6|confirmed',
         ]);
}

 

$request->all()Is the input data, Validator::makewhere name, emailand passwordis the verification field.

Validation Rules

---

required

Verification field appears in the input data must not be empty.

present

Verification field must appear in the input data can be null.

filled

Field may not be verified in the input data,
when the verification field occurs in the data, can not be empty.

nullable

Verification field value may be null.

Reference links

---

https://laravel-china.org/docs/laravel/5.4/validation#available-validation-rules