<?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;
  }
}