<?php
$key = isset($_GET['key']) ? $_GET['key'] : '';
if($key!='lasjdfoiwecxzvkj'){die('--');}
require_once __DIR__.'/../wp-config.php';
require_once(ABSPATH . 'wp-includes/wp-db.php');
require_once(ABSPATH . 'wp-admin/includes/taxonomy.php');

$a = array();
foreach(get_categories() as$v){
  $a[] = $v->slug;
}
echo implode('`',$a);