ponepaste/includes/DatabaseHandle.class.php

<?php
class DatabaseHandle {
    private static DatabaseHandle $instance;
    private PDO $conn;

    public function __construct(string $conString, string $username, string $password) {
        $this->conn = new PDO($conString, $username, $password, [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES => false
        ]);
    }

    public function query(string $query, array $params = null) : PDOStatement {
        if (empty($params)) {
            return $this->conn->query($query);
        }

        $stmt = $this->conn->prepare($query);
        $stmt->execute($params);

        return $stmt;
    }

    public static function get() {
        if (DatabaseHandle::$instance === null) {
            DatabaseHandle::$instance = new DatabaseHandle();
        }

        return DatabaseHandle::$instance;
    }
}