使用方法

// scenario is set as a property$model = new User;$model->scenario = User::SCENARIO_SHOW;// scenario is set through configuration$model = new User(['scenario' => User::SCENARIO_SUBMIT]);

举例说明

      ['username', 'password'],            self::SCENARIO_SUBMIT => ['username', 'email', 'password'],        ];    }    public function rules()    {        return [            // username, email and password are all required in "submit" scenario            [['username', 'email', 'password'], 'required', 'on' => self::SCENARIO_SUBMIT],            // username and password are required in "show" scenario            [['username', 'password'], 'required', 'on' => self::SCENARIO_SHOW],        ];    }        public function attributeLabels()    {        switch($this->scenario)        {            case self::SCENARIO_SHOW:                $labels = [                    'username' => 'User Name',                    'password' => 'Password',                ];                break;            case self::SCENARIO_SUBMIT:                $labels = [                    'username' => 'User Name',                    'password' => 'Password',                    'email' => 'Your email address',                ];                break;        }        return $labels;    }}