PHP获取当前url的函数

  //PHP获取当前url  function getCurrentUrl() {      $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";      $url = $protocol.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];      return $url;  }