Removing Metacharacters in php

We are using PHP co开发者_运维问答de. For security reason we need to remove the Metacharacters from User Supplied Datas.

How is it possible by preg or any other inbuilt function is in PHP?

---

Assuming you mean "Characters which cause SQL Injection or XSS problems".

No, you don't. Just practise good escaping practises before you make queries, or output markup.