play.benjamin-kraft.eu/public/php/mysql_connect.php

<?php

class MySQLConnection {

    private int $port;
    private string $host;
    private string $user;
    private string $pass;
    private string $dbName = "website";
    private mysqli $mysqli;

    public function __construct() {
        $env = parse_ini_file($_SERVER['DOCUMENT_ROOT'] . '/../.env');
        $this->host = 'localhost';
        $this->port = $env['MYSQL_PORT'];
        $this->user = $env['MYSQL_USER'];
        $this->pass = $env['MYSQL_PASSWORD'];
        $this->createConn();
    }

    private function createConn(): void {
        $this->mysqli = new mysqli($this->host . ":" . $this->port, $this->user, $this->pass, $this->dbName);
    }

    public function query($sql): mysqli_result|bool {
        return $this->mysqli->query($sql);
    }

    public function changeDB($dbName): void {
        $this->dbName = $dbName;
        $this->mysqli->select_db($dbName);
    }

    public function __destruct() {
        $this->mysqli->close();
    }

}