Use these websites to help your students identify fact and fiction.Keep in mind that even these websites should only be one of many sources of information.It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.
Every resource you find has been evaluated in one way or another before you ever see it.
The rules may be implemented through the automated facilities of a data dictionary, or by the inclusion of explicit application program validation logic.
Data validation is intended to provide certain well-defined guarantees for fitness, accuracy, and consistency for any of various kinds of user input into an application or automated system.
[Links checked February/10/2017] User’s input can be validated on the server and on the client (web browser).
Thus we have server-side and client-side validation. In the server-side validation, information is being sent to the server and validated using one of server-side languages.