织梦出现系统基本参数空白或显示Call to undefined function make_hash()

function make_hash(){    $rand = dede_random_bytes(16);    $_SESSION['token'] = ($rand === FALSE)        ? md5(uniqID(mt_rand(),TRUE))        : bin2hex($rand);    return $_SESSION['token'];}function dede_random_bytes($length){    if (empty($length) OR ! ctype_digit((string) $length))    {        return FALSE;    }    if (function_exists('random_bytes'))    {        try        {            return random_bytes((int) $length);        }        catch (Exception $e)        {            return FALSE;        }    }    if (defined('MCRYPT_DEV_URANDOM') && ($output = mcrypt_create_iv($length,MCRYPT_DEV_URANDOM)) !== FALSE)    {        return $output;    }    if (is_readable('/dev/urandom') && ($fp = fopen('/dev/urandom','rb')) !== FALSE)    {        is_PHP('5.4') && stream_set_chunk_size($fp,$length);        $output = fread($fp,$length);        fclose($fp);        if ($output !== FALSE)        {            return $output;        }    }    if (function_exists('openssl_random_pseudo_bytes'))    {        return openssl_random_pseudo_bytes($length);    }    return FALSE;}