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We cannot relay on data that are only validated in client side because a expert level user may change those data before submission to the server.
Bad data can harm a server, steal information or even can delete a whole database.
If the user does not comply with these rules, an error message will be displayed.
Any fields already completed will be left unchanged, allowing the user to simply adjust her input and re-submit the form without having to enter all of the data again. The exception is the brochure checkbox which does not need to be validated as it is an optional field.
There are two specific attributes that need to be set in the form tag, .
This prevents the form from breaking if the user submits HTML markup and also is a means of protecting against XSS (Cross Site Scripting) attacks, which attackers will use to try to exploit vulnerabilities in web applications.
I'm not sure about 5.3.4 final, but it is written that some 5.3.4-snapshot versions also were affected.
In this article you’ll construct and validate a simple form using HTML and PHP.
At the start of the script, before any HTML, you can check whether the form has been submitted using attribute, and I’ve also marked whether or not the field is a required field for validation purposes.To determine whether the form has been submitted by the user, either check the request method (an example follows in the next section) or check for the presence of a specific form control (usually the submit button).Whichever method you use, if the form has been submitted, it should be validated.As server side form validation is done on server, the submitted data is validated and cleaned by server and then it is used.
No one can modify those data without having access to the server. If you want, you can use get method, just change method=”get” and replace $_POST with $_GET – that’s all.
Any errors or omissions will be highlighted with a message alongside the relevant field. The purpose of the form is to capture user details (name, address, and email) to obtain feedback (on fruit consumption and favorite fruit) and request a brochure.