buildConnectionString example

        return implode(';', $connectionSettings);
    }

    /** * @return PDO */
    private function createConnection(array $dbConfig)
    {
        $password = isset($dbConfig['password']) ? $dbConfig['password'] : '';
        $connectionString = $this->buildConnectionString($dbConfig);

        try {
            $conn = new PDO(
                'mysql:' . $connectionString,
                $dbConfig['username'],
                $password
            );

            $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $conn->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);

            

    public static function createPDO(array $dbConfig)
    {
        if (isset($dbConfig['factory']) && class_exists($dbConfig['factory'])) {
            $factory = $dbConfig['factory'];

            return $factory::createPDO($dbConfig);
        }

        $password = $dbConfig['password'] ?? '';
        $connectionString = self::buildConnectionString($dbConfig);

        try {
            $conn = new PDO(
                'mysql:' . $connectionString,
                $dbConfig['username'],
                $password,
                $dbConfig['pdoOptions'] ?? null
            );

            $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $conn->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);