修复解序列失败，导致无法显示banner

使用Docker按照官方流程安装，最后打开首页，发现没有显示banner，查看源码发现在fecshop\services\cms\staticblock\StaticBlockMysqldb 类的getByIdentify方法解序列失败，原因大概是解码与编码不一致，导致特殊符号长度不一。

public function getByIdentify($identify)
    {
        $one = $this->_staticBlockModel->find()->asArray()->where([
            'identify' => $identify,
        ])->one();
        foreach ($this->_lang_attr as $attrName) {
            if (isset($one[$attrName])) {
                $one[$attrName] = unserialize($one[$attrName]);
            }
        }

        return $one;
    }

在网上找到解决方法：

public function getByIdentify($identify)
    {
        $one = $this->_staticBlockModel->find()->asArray()->where([
             'identify' => $identify,
        ])->one();
        foreach ($this->_lang_attr as $attrName) {
            if (isset($one[$attrName])) {
                // $one[$attrName] = unserialize($one[$attrName]);
                $one[$attrName] = $this->mb_unserialize($one[$attrName]);
            }
        }

        return $one;
    }

    protected function mb_unserialize($serial_str) 
    {
        $serial_str = preg_replace_callback('/s:(\d+):"([\s\S]*?)";/', function($matches) {
            return 's:'.strlen($matches[2]).':"'.$matches[2].'";';
        }, $serial_str);
        return unserialize($serial_str); 
    }