// Aktiviere den WordPress-Wartungsmodus

function activate_maintenance_mode() {

    if (!current_user_can(‘edit_themes’) || !is_user_logged_in()) {

        wp_die(‘<h1>Wartungsarbeiten</h1><br />Website unter geplanter Wartung. Bitte schau später wieder vorbei.’);

    }

}

add_action(‘get_header’, ‘activate_maintenance_mode’);<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /homepages/18/d629242410/htdocs/wp-content/themes/Avada-Child-Theme/functions.php:1) in <b>/homepages/18/d629242410/htdocs/wp-includes/pluggable.php</b> on line <b>1331</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /homepages/18/d629242410/htdocs/wp-content/themes/Avada-Child-Theme/functions.php:1) in <b>/homepages/18/d629242410/htdocs/wp-includes/pluggable.php</b> on line <b>1334</b><br />