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// Activate WordPress Maintenance Mode
function wp_maintenance_mode(){
if(!current_user_can('edit_themes') || !is_user_logged_in()){
wp_die('<h1 style="color:red">Website under Maintenance</h1><br />We are performing scheduled maintenance. We will be back online shortly!');
}
}
add_action('get_header', 'wp_maintenance_mode');
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