Db.php

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<?php
 
namespace ComusParty\App;
 
use Exception;
use PDO;
use PDOException;

class Db
{
    private static ?Db $instance = null;

    private ?PDO $pdo;

    private function __construct()
    {
        try {
            $this->pdo = new PDO(DB_TYPE . ':host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASS,
                array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
            $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        } catch (PDOException $e) {
            echo 'Connection failed: ' . $e->getMessage();
        }
    }

    public static function getInstance(): Db
    {
        if (self::$instance == null) {
            self::$instance = new Db();
        }
        return self::$instance;
    }

    public function getConnection(): PDO
    {
        return $this->pdo;
    }

    public function __wakeup()
    {
        throw new Exception("Cannot unserialize a singleton.");
    }

    private function __clone()
    {
    }
}