Класс CSRF

<?php
class csrf
{
protected $hash = '';
 
public function __construct ()
{
$hash = $this->getHash();
setcookie('csrf_test', $hash, (time()+120), '/');
}
 
public function getHash ()
{
if ($this->hash == '') $this->hash = md5(time());
return $this->hash;
}
 
public function check ()
{
if (isset($_COOKIE['csrf_test'], $_POST['csrf_test']))
{
if ($_COOKIE['csrf_test'] != $_POST['csrf_test'])
{
exit('CSRF PTOTECTED: иди на хуй');
}
 
}
else
{
exit('CSRF PTOTECTED: иди на хуй');
}
 
}
 
public function hidden ()
{
return '<input type="hidden" name="csrf_test" value="'.$this->hash.'">';
}
 
public function _check ()
{
if (isset($_COOKIE['csrf_test'], $_GET['csrf_test']))
{
if ($_COOKIE['csrf_test'] != $_GET['csrf_test'])
{
exit('CSRF PTOTECTED: иди на хуй');
}
 
}
else
{
exit('CSRF PTOTECTED: иди на хуй');
}
}
}
?>