Regarding the problem of php processing data passed by ckeditor

I recently used ckeditor to build a website, but how should I deal with its data? Its own filtering is based on js and is controllable. If you use php to filter, if you use addslashes and htmlspecialchars, its style tags will also be filtered. How do you deal with it?

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I recently used ckeditor to build a website, but how should I deal with its data? Its own filtering is based on js and is controllable. If you use php to filter, if you use addslashes and htmlspecialchars, its style tags will also be filtered. How do you deal with it?