vitalik1921

Use:

if ($_POST['sml_subscribe']) {
	$name = $_POST['sml_name'];
	$email = $_POST['sml_email'];
	if (is_email($email)) {

		$count = $wpdb->get_var("SELECT COUNT(*) FROM ".$wpdb->prefix."sml where sml_email like '".$wpdb->escape($email)."' limit 1");
		if ($count <1) {
			$wpdb->query("insert into ".$wpdb->prefix."sml (sml_name, sml_email) values ('".$wpdb->escape($name)."', '".$wpdb->escape($email)."')");
		}
	}
}