Staging_Site_Alert.php

// Alert on Staging Site
// http://stackoverflow.com/questions/6522023/php-if-domain
$host = $_SERVER['HTTP_HOST'];
if ($host != 'XXXXXXXXXX.com') {
    function staging_admin_error_notice()
    {
        $class = "error";
        $message = "You are on the staging site.";
        echo"<div class=\"$class\"> <h1>$message</h1></div>";
    }
    add_action('admin_notices', 'staging_admin_error_notice');
}