lithium\storage\cache\adapter\XCache::clear PHP Method

    public function clear()
    {
        $admin = ini_get('xcache.admin.enable_auth') === "On";
        if ($admin && (!isset($this->_config['username']) || !isset($this->_config['password']))) {
            return false;
        }
        $credentials = array();
        if (isset($_SERVER['PHP_AUTH_USER'])) {
            $credentials['username'] = $_SERVER['PHP_AUTH_USER'];
            $_SERVER['PHP_AUTH_USER'] = $this->_config['username'];
        }
        if (isset($_SERVER['PHP_AUTH_PW'])) {
            $credentials['password'] = $_SERVER['PHP_AUTH_PW'];
            $_SERVER['PHP_AUTH_PW'] = $this->_config['pass'];
        }
        for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
            if (xcache_clear_cache(XC_TYPE_VAR, $i) === false) {
                return false;
            }
        }
        if (isset($_SERVER['PHP_AUTH_USER'])) {
            $_SERVER['PHP_AUTH_USER'] = $credentials['username'];
        }
        if (isset($_SERVER['PHP_AUTH_PW'])) {
            $_SERVER['PHP_AUTH_PW'] = $credentials['password'];
        }
        return true;
    }