Validating radio button with php

The server side form validations help keeping the form submission data consistent.The validations also help in lesser server side errors.You may print some message after sending mail optionally.Client-side form validations help in giving immediate feedback to the user.In this tutorial, we will see how to use PHP to validate the data collected from a form.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.That could cause some issues in some browsers, especially if you are using Javascript. Also, what are you using an empty a element for (which doesn't have an href attribute, by the way)? These pages will show how to process PHP forms with security in mind.

If it has not been submitted, skip the validation and display a blank form.

The first thing you should do is test whether any radio buttons are selected or not with the isset function.

After that, you should then check to see which radio button was clicked.

It is also required to add server side form validation in your form processing script.

The user can disable Javascript on their server or even auto-bots might try to submit your form as well.