How can I allow my user to insert HTML code, without risks? (not only technical risks)

Question

I developed a web application, that permits my users to manage some aspects of a web site dynamically (yes, some kind of cms) in LAMP environment (debian, apache, php, mysql

Answer 1

I use this php strip_tags function because i want user can post safely and i allow just few tags which can be used in post in this way nobody can hack your website through script injection so i think strip_tags is best option

Clich here for code for this php function