infoweb\cms\behaviors\ImageBehave::getAliasString PHP Method

    private function getAliasString()
    {
        if ($this->createAliasMethod) {
            $string = $this->owner->{$this->createAliasMethod}();
            if (!is_string($string)) {
                throw new \Exception(Yii::t('app', 'Invalid image alias'));
            } else {
                return $string;
            }
        } else {
            return substr(md5(microtime()), 0, 10);
        }
    }