yii\db\BaseActiveRecord::setAttribute PHP Method

    public function setAttribute($name, $value)
    {
        if ($this->hasAttribute($name)) {
            $this->_attributes[$name] = $value;
        } else {
            throw new InvalidParamException(get_class($this) . ' has no attribute named "' . $name . '".');
        }
    }

 /**
  * Populates an active record object using a row of data from the database/storage.
  *
  * This is an internal method meant to be called to create active record objects after
  * fetching data from the database. It is mainly used by [[ActiveQuery]] to populate
  * the query results into active records.
  *
  * When calling this method manually you should call [[afterFind()]] on the created
  * record to trigger the [[EVENT_AFTER_FIND|afterFind Event]].
  *
  * @param BaseActiveRecord $record the record to be populated. In most cases this will be an instance
  * created by [[instantiate()]] beforehand.
  * @param array $row attribute values (name => value)
  */
 public static function populateRecord($record, $row)
 {
     foreach ($record->attributes() as $name) {
         $record->setAttribute($name, isset($row[$name]) ? $row[$name] : null);
         if (isset($row[$name]) && $record->canSetProperty($name)) {
             $record->{$name} = $row[$name];
         }
     }
     $record->setOldAttributes($record->attributes);
 }