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If you are interested in autoloading classes, you can check our tutorial.As in the above code, I have created the method // validate an integer $number = Input::int($_POST['number']); // validate a string $name = Input::str($_POST['name']); // convert to boolean $bool = Input::bool($_POST['boolean']); // validate an email $email = Input::email($_POST['email']); // validate a URL $url = Input::url($_POST['url']); function was described with it's filters with examples.Here is the PHP script that checks the name for empty input and throws an error if the input is empty.When we display the form back again, it should not loose the form data the user already had filled-in.So, in the next step we will be creating a class to validate inputs in a more convenient way.I assume that you have basic knowledge on Object Oriented Programming. Our class must prevent XSS attacks and validate inputs.(note that the form method is post in the HTML form).
The validations also help in lesser server side errors.It is also required to add server side form validation in your form processing script.