Store HTML in database

Hi,

In my web, users can write their custom HTML and I store it in MySQL database.

Which is the best way to store this HTML? 

CI4 escape this html by default? should i use htmlspecialchars, addslashses, etc or something like that? base64 encode maybe? or it is not necessary?

Thank you.

I would allow specific BBC-Tags. Not pure HTML.
Than you can convert the tags to the corresponding HTML tag.

First rule for security: Never trust user input

Edit: If you really want storing HTML in your database, then take a look at http://htmlpurifier.org/