This class can be used to escape values of request variables.
It traverses the arrays of request super-global variables $_GET, $_POST, $_REQUEST and $_COOKIE.
The class escapes the values of the request variables add escape slashes characters to quotes, backslashes and NUL characters, so the values can be used in database queries without further escaping.
As I have closely watched PHPClasses for a long time now, I must say that I never saw a class which is simple yet very effective in sanitizing user input which is a major security concern for every web application. I have used simple logic and methods to clean malicious input and make database interaction a bit safer.