Validating a form with php

Otherwise, you could generate the images yourself using the GD library.

The security concern lies in the fact that the PHP page handling the form will do something with the information the user enters: store it in a database, pass it along to another page, or use it in an email.

If the information the user enters is tainted, you could have a major problem on your hands. Mistakes can happen, either on purpose or by accident, that could reveal flaws in your code, cause the loss of data, or bring your entire system to a crashing halt.

", and "Does the E-mail field contain a valid e-mail address syntax?

", and if filled out, "Does the Website field contain a valid URL?

To be certain, this next example will present a sample registration form (Figure 4.1), taking various types of information, which will then be precisely validated.

In doing so, I'll make use of a couple of Character Type functions, added to PHP in version 4.3.

Finally we have created a bootstrap login form with jquery validation in php.

Handling form data is still far and away the most common use of PHP (in this author's humble opinion, anyway).

Required field will check whether the field is filled or not in the proper way.

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