The third topic is the new-to-PHP 5 PECL library called Filter.
Its usage isn't very programmer-friendly, but the way it wraps all of the customary data filtering and sanitizing methods into one interface makes it worth knowing.
On the other hand, users will have to fill in the information without getting a response until they submit the form. Validation in this context refers to validating rules such as username availability.
You can read more about validation with Ajax in this excellent tutorial on j Query For Designers.
The focus in this chapter is therefore how to make your applications more secure.
This chapter will begin by rehashing the fundamentals of secure PHP programming.
Sadly, most beginning programmers fail to understand the truth about security: there is no such thing as "secure" or "insecure." The wise programmer knows that the real question is a site is.
Nobody wants to shoot them but if they press their luck..
If the validation fails, the response is then sent back to the client, page that contains the web form is refreshed and a feedback is shown.
This method is secure because it will work even if Java Script is turned off in the browser and it can’t be easily bypassed by malicious users. Ajax calls to the server can validate as you type and provide immediate feedback.
Ideally, users will fill the web form with necessary information and finish their job successfully. In this article we will go beyond the validation itself and explore different validation and error feedback techniques, methods and approaches.
The goal of web form validation is to ensure that the user provided necessary and properly formatted information needed to successfully complete an operation.