<?php
$servername = "localhost";
$username = "autoaukcje_wp1";
$password = "W)0[2cz[]jZGDvLgUY.50(]6";
$dbname = 'autoaukcje_wp1';

// Create connection


$mydb = new wpdb($username, $password, $dbname, $servername);
// echo var_dump($mydb);
$sql = "SELECT `ID` FROM `wp_posts`  WHERE `post_status` = 'publish' AND  `post_type` = 'listing_type' ORDER BY 'post_date' DESC ";
$rows = $mydb -> get_var( $sql, 0, 0 );
echo var_dump($rows);
foreach ($rows as $obj) :
   echo $obj->id;
endforeach;


?>