src/models/BaseConfigurationModel.php
public function loadState($statePath)
    {
        $filename = Yii::getAlias($statePath . $this->stateFilename() . '.php');
        if (is_readable($filename) === true) {
            $this->loadAttributesFromState(
                include($filename)
            );
            return true;
        } else {
            return false;
        }
    }
public function loadState($statePath)
    {
        $filename = Yii::getAlias($statePath . $this->stateFilename() . '.php');
        if (is_readable($filename) === true) {
            $this->loadAttributesFromState(
                include($filename)
            );
            return true;
        } else {
            return false;
        }
    }
Loads state from file
@param string $statePath Path where model state files are stored.
@return bool result