How to properly implement singleton in PDO?

Question

PHP

There is a database class which returns only one pdo object.
All this is implemented as follows:

private static $instance;
  
  private function __construct(){}
  
  private function __clone(){}
  
  public static function getInstance(){
    $options =  func_get_args();
    $connectString=array_shift($options);
    $user=array_shift($options);
      $password=array_shift($options);
    return !static::$instance instanceof PDO? static::$instance = new PDO($connectString,$user,$password,$options) : static::$instance;
  }

The code is working, but is it possible to implement it somehow more pokasherno?