original_string: protected function validation()
      {
          if (null === $this->validation) {
              $this->validation = new ValidationBuilder($this);
          }
  
          return $this->validation;
      }
code: protected function validation()
      {
          if (null === $this->validation) {
              $this->validation = new ValidationBuilder($this);
          }
  
          return $this->validation;
      }
code_tokens: protected function validation ( ) { if ( null === $ this -> validation ) { $ this -> validation = new ValidationBuilder ( $ this ) ; } return $ this -> validation ; }
docstring: Gets the builder for validation rules.
  
  @return ValidationBuilder
docstring_tokens: Gets the builder for validation rules .