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When the form is submitted, but not validated, the code execution flows through to the page.We can avoid this, and make our code more modular and reusable, by calling it as a function: The extract method turns key/value pairs from the $_POST array into separate variables, but only for the scope of the function. urlencode($_POST['var3']) header("Location: $location"); exit; I have an issue when i update form if input type i entered is wrong then page go back to the old value that is entered before and displays error message "enter valid name or address etc".We could go further and create a form validation class, with separate methods for validating text, email, dates, etc, but that's a project in itself. but i want that it displays error "enter valid name address etc" and value does not change, it remains the same that i have given wrong.Server-side validation of user input is something you run into once in a while and although it is not an overly complicated subject, there are a couple of gotchas to be aware of.This blog post examines how to validate a simple form in PHP. It could look something like this: So, now let’s make our form do something useful.