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Proper validation of form data is important to protect your form from hackers and spammers!

The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button: The validation rules for the form above are as follows: This code adds a script tag and an alert command.

If the REQUEST_METHOD is POST, then the form has been submitted - and it should be validated.

In this tutorial you will learn how to implement a simple contact form on your website that allows the user to send their comment and feedback through email.

While Validating an HTML form the client side validation is not only enough.

Since our web application allows outsiders to enter data, server-side form validation is also required for additional security.

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

Most of cases we will use the * symbol for required field.

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