Validating a form in php

13-Oct-2017 18:15 by 9 Comments

Validating a form in php

In this tutorial you'll learn how to sanitize and validate form data using PHP filters.

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Many sites feature web forms to collect information from users.

You will see how to validate various fields used in general, like text, list, checkbox, radio button and we will also see how to retain POST data, so that after the user submits the form, even if the data supplied is not valid, data is not lost.

Live Demo Following is a live demo of the PHP form we will create by the end of this tutorial.

The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?

There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation, to be on the safe side.

More and more browsers now support the constraint validation API, and it's becoming reliable.

This API consists of a set of methods and properties available on each form element.states that after submission form data will be handled by the PHP script present in this file only.You may opt for sending form data to a different file.One of the features of HTML5 is the ability to validate most user data without relying on scripts.This is done using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, etc., and a pattern that it must match.Unfortunately, these forms often provide a poor experience for the user, with predictable results.

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