Yii2 simple way to add a validation code to a form _php instance

The example in this article describes the simple implementation of the Yii2 method to add a validation code to a form. Share to everyone for your reference, specific as follows:

Controller Sitecontroller:

Class Sitecontroller extends Controller
{
  //...
  Public function actions ()
  {return
    [
      //...
      ] Captcha ' => [
        ' class ' => ' yii\captcha\captchaaction ',
        ' Fixedverifycode ' => yii_env_test? ' Testme ': null,
      ],
    ];
  }
  // ...
}
? >

Define form Model:

Class Contactform extends Model
{
  //...
  public $verifyCode;
  // ...
  Public function rules ()
  {return
    [
      //...
      ] [' Verifycode ', ' captcha '],
    ];
  }
  // ...
}
? >

To call a method in view:

$form = Activeform::begin ([' id ' => ' contact-form ']);?>
//...
$form->field ($model, ' Verifycode ')->widget (Captcha::classname ())?>
//...
Activeform::end ();?>

For more information on YII-related content, readers who are interested in this site can view the topics: Introduction to YII Framework and summary of common skills, "Summary of PHP Excellent development framework", "Smarty Template Introductory Course", "Introduction to PHP object-oriented programming", "PHP string" Summary of Usage , "Php+mysql Database operation Introduction Tutorial" and "PHP common database Operation Skills Summary"

I hope this article will help you with the PHP program design based on the YII framework.