// Set website in maintenance mode.
function maintenace_mode() {
if ( !current_user_can( 'edit_themes' ) || !is_user_logged_in() ) {wp_die('Maintenance.');}
}
add_action('get_header', 'maintenace_mode');
To de-activate maintenance mode, simply comment out the add_action line. And no, it’s not a typo.
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