WP-Block Admin

if (is_user_logged_in() ) {
        // Is this the admin interface?
        if (
            // Look for the presence of /wp-admin/ in the url
            stripos($_SERVER['REQUEST_URI'],'/wp-admin/') !== false
            ||
            // Look for the presence of /wp-login.php/ in the url
            stripos($_SERVER['REQUEST_URI'],'/wp-login.php') !== false
            &&
            // Allow calls to async-upload.php
            stripos($_SERVER['REQUEST_URI'],'async-upload.php') == false
            &&
            // Allow calls to admin-ajax.php
            stripos($_SERVER['REQUEST_URI'],'admin-ajax.php') == false

        ) {

            // Does the current user fail the required capability level?
            if (!current_user_can($wpba_required_capability)) {
            // If you want to use this plugin on WPMU to stop all users accessing the admin interface, comment out the line above, uncomment the line below.
//          if (!is_site_admin()) {

                // Do we need to default to the site homepage?
                if ($wpba_redirect_to == '') { $wpba_redirect_to = get_option('siteurl'); }

                // Send a temporary redirect
                wp_redirect($wpba_redirect_to,302);

            }

        }

    }
    }//end if logged in

}