<?php

//exemple d'appel 
Database::getInstance();

class Database {
  
  private static $instance;
  
  private $pdo;
  
  private $host;
  
  private $dbName;
  
  private $userName;
  
  private $password;
  
  public function __construct($host, $dbName, $userName, $password) {
    $this->host = $host;
    $this->dbName = $dbName;
    $this->userName = $userName;
    $this->password = $password;
  }
  
  public static function getInstance() {
    if(static::$instance == null) {
       static::$instance = new Database($host, $dbName, $userName, $password);
    }
    
    return static::$instance;
  }
}