While I was implementing a modification scheme based on the registration number from Wiki, I encountered some strange bugs. Below is the Wiki:&The problem I encountered is listed below (I don't know PHP or other programming languages, this is just a personal solution sharing).
ICP record number
Due to legal requirements on the Chinese mainland, all websites hosted on the Chinese mainland must display their ICP record number. You can modify `./application/views/interface_assets/footer.php` to include the necessary information for website registration.


The solution is provided below:
Add it to the /assets/css/general.css file.
.footer-link {
text-align: center;
position: absolute;
bottom: 0;
left: 0;
right: 0;
}
Add the following code to the end of ./application/views/interface_assets/footer.php
<?php if ($this->URI>segment(2) == "login" ) { ?>
<a class="footer-link" href="https://beian.miit.gov.cn/" target="_blank">Your registration number</a>
<?php }>
Simply restarting Apache2 will resolve the issue.

The results are shown in the figure below.