How Preventing HTML Tag go in Database?

[doomz]

I have a some problem. when user maybe suddenly or not inserting some word like "<table>" or some other 'html' or 'java script' tag. this will cause the whole webpage error or display change.

how to prevent this thing?

I try to using regular expression to change the input before save into data base but I'm not good in regular expression syntax. it confuse me T_T

please help ^_^ or any other solution?

[Fumigator]

strip_tags()

[kreoton]

also look at function htmlspecialtags()