Codeigniter - Update email only if the email doesn't exist in the database

Question

I have an update page for my users where they can edit their name, email and other info.

So far, they can edit everything. Including their email. They can enter an e

Answer 1

use validate library : http://docs.jquery.com/Plugins/Validation/Methods/remote

your javascript :

$("#yourFormId").validate({
        rules: {
            email: {
                required: true,
                email: true,
                remote: {
                    url: "checkmail.php",
                    type: "post"
                 }
            }
        },
        messages: {
            email: {
                required: "Please Enter Email!",
                email: "This is not a valid email!",
                remote: "Email already in use!"
            }
        }
    });

checkmail.php:

if you use codeigniter means use checkmail.php as a controller function.. you can pass your $registeredEmails array values as $registeredEmails[] = "your query result which is in for loop".