required if present laravel code example

Example 1: numbric validate laravel

$rules = ['Fno' => 'numeric|min:2|max:5', 'Lno' => 'numeric|min:2'];

Example 2: email validation in laravel

'email' => 'required|email|unique:users,email',
//@sujay

Example 3: laravel validation types for float

//For float, must use numeric validator

/**
  * Get the validation rules that apply to the request.
  *
  * @return array
 */
public function rules()
{
  return [
    'field' => 'numeric'
  ];
}