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And nearly every website uses forms to allow website visitors to contact the organization or person administering the website.
Web forms are made possible by the integration of multiple technologies: In this guide, we’re going to cover all of the HTML elements used to create web forms.
The previous three parts of this series (part 1, part 2 and part 3) explained how to create the HTML part of a web form (the client side).
In order to make the form useful, we need to add server side processing support to the form. There are scripting languages like PHP , ASP and Perl that can be used to write the server side form processing script.
Important Validating user input is also important for security.
When users enter values into an HTML form, the values that they enter are strings.
A formmail script is the easiest way to collect submissions from the HTML forms.
Although this seems like a trivial question, I am quite sure it is not :) I need to validate names and surnames of people from all over the world. If it were only English ones I think that this would cut it: I doubt that this is feasible - there are just to much Unicode symbols to exclude all unwanted symbols (and how will tell you what Chinese symbols to exclude?
If all you're doing is reading and writing to the db, then properly parameterizing queries should take care of the problem.
However, if you're ever going to dynamically execute code from the db, then you have to be careful (such as using the exec() statement.