PHP based solution to handle the backend of a WYSIWYG editor

I came across a WYSIWYG HTML5 Editor built for Bootstrap and was wondering if there were any lite frameworks(PHP and MySQL based) to handle the backend. I didn’t really want to mess with wordpress or other complete CMS systems. I will only have a couple pages where the editor will be used and would rather keep everything simple.

I have build simple cms’s with PHP and MySQL that allowed the user to change text on the page with a form, but nothing like the WYSIWYG HTML5 Editor that is changing the tags, styles, and content.

Here is a link to the editor I was thinking about.
https://wrapbootstrap.com/theme/bootstrap-live-editor-WB0DFT966

any ideas or tutorials that cover this?

Best php framework: