Question

I am currently working with AJAX/JS to have form without a button click or page refresh. The inquiry I have is in regards of email validation. Right now the PHP code checks if an email address is valid or not. I would like to only have it accept emails from a certain domain. How can I achieve through php to accept only email address from gmail? Example

PHP for validation of email:

if($_POST) {
    $email = $_POST['email'];
    if (preg_match('|^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$|i', $email)) {
        echo ('<div id="email_input"><span id="resultval">'.$email.'</span></div>');
    }
    else {
        echo ('<div id="email_input"><span id="resultval">Include a valid email address.</span></div>');
    }
}

Answer 1

Php has an easy function to help you with checking if an email address is valid:

$isValid = filter_var($email, FILTER_VALIDATE_EMAIL);

To check if the email adress is a gmail address, the following would do the trick:

list ($user, $domain) = explode('@', $email);
$isGmail = ($domain == 'gmail.com');