code: public function load($data, $formName = null)
      {
          $scope = $formName === null ? $this->formName() : $formName;
          if ($scope === '' && !empty($data)) {
              $this->setAttributes($data);
  
              return true;
          } elseif (isset($data[$scope])) {
              $this->setAttributes($data[$scope]);
  
              return true;
          }
  
          return false;
      }
docs: Populates the model with input data.
  
  This method provides a convenient shortcut for:
  
  ```php
  if (isset($_POST['FormName'])) {
  $model->attributes = $_POST['FormName'];
  if ($model->save()) {
  // handle success
  }
  }
  ```
  
  which, with `load()` can be written as:
  
  ```php
  if ($model->load($_POST) && $model->save()) {
  // handle success
  }
  ```
  
  `load()` gets the `'FormName'` from the model's [[formName()]] method (which you may override), unless the
  `$formName` parameter is given. If the form name is empty, `load()` populates the model with the whole of `$data`,
  instead of `$data['FormName']`.
  
  Note, that the data being populated is subject to the safety check by [[setAttributes()]].
  
  @param array $data the data array to load, typically `$_POST` or `$_GET`.
  @param string $formName the form name to use to load the data into the model.
  If not set, [[formName()]] is used.
  @return bool whether `load()` found the expected form in `$data`.