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Ko sevī glabā šis mainīgais?


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Tā tad,cik saprotu,tad $_instance mainīgais DB klasē ir DB instance,kad funkcija tiek izsaukta,kam pieejamas visas DB klases funkcijas.Kad tiek izsaukts  self::$_instance = new DB();    tad aiziet  __constructor metode un $_instance tiek pievienots _pdo, tad šis mainīgais tiek atgriezts. Es pareizi tik tālu sapratu? Un tad,kad kādā mainīgajā raksta $user = DB::getInstance(); , tad $user praktiski ir vienāds ar $_instance mainīgo?    Un ja raksta  $user = DB::getInstance()->query(); ,tad query funkcija pieder $user mainigajam vai $_instance metodei?        

$user = DB::getInstance();
class DB {
  private static $_instance = null;
  private $_pdo, 
   private function __construct () {
	     try {
	         $this-> _pdo = new PDO('mysql:host='.Config::get('mysql/host').';dbname='.Config::get('mysql/db'),Config::get('mysql/username'),Config::get('mysql/password'));
	     }catch(PDOException $e){
   //singleton,the instance can be created only once
   public static function getInstance(){
	     if (!isset(self::$_instance)) {
	     	self::$_instance = new DB();
	     return self::$_instance;

Paldies ,ja kaut ko nesaprotat, tad prasat!

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