PHP and WebView - Cookie doesn't are the same

php android cookies webview logout

PHP Snippet 1:

CookieManager.getInstance().cookieManager.flush();

PHP Snippet 2:

setcookie("USER_ID", 0, time()-3600);
unset($_COOKIE['USER_ID']);
header('Location: ./index.php');

PHP Snippet 3:

<?php
session_start();
session_destroy();

// thats all
// you can unset all php sessions if you wants
?>