问Codeigniter CSRF保护与标签

EN

function csrf_verify()
{
    // If no POST data exists we will set the CSRF cookie
    if (count($_POST) == 0)
    {
        return $this>csrf_set_cookie();
    }

    // Do the tokens exist in both the _POST and _COOKIE arrays?
    if ( ! isset($_POST[$this->csrf_token_name]) OR
         ! isset($_COOKIE[$this->csrf_cookie_name]) )
    {
        $this->csrf_show_error();
    }

    // Do the tokens match?
    if ( $_POST[$this->csrf_token_name]
         != $_COOKIE[$this->csrf_cookie_name] )
    {
        $this->csrf_show_error();
    }

    // We kill this since we're done and we don't
    // want to polute the _POST array
    unset($_POST[$this->csrf_token_name]);

    // Re-generate CSRF Token and Cookie
    unset($_COOKIE[$this->csrf_cookie_name]);
    $this->_csrf_set_hash();
    $this->csrf_set_cookie();

    log_message('debug', "CSRF token verified ");
}

// Re-generate CSRF Token and Cookie
unset($_COOKIE[$this->csrf_cookie_name]);
$this->_csrf_set_hash();
$this->csrf_set_cookie();