PHP Email Validation

php_email-validation

<?

if (isset($_POST['action']) && !empty($_POST['action'])) {

	$action = $_POST['action'];
	switch($action) {
		
		case 'validate_domain':
			
			// If we're not passing in an email address, automatically return false.
			if (!isset($_POST['email']) || empty($_POST['email'])) return false;
			
			return domain_exists($_POST['email']);
			break;
	}
}

function domain_exists($email, $recordType = 'MX') {
	list($user, $domain) = split('@', $email);
   	echo checkdnsrr($domain, $recordType) ? "true" : "false";
}