Method connect

compatibility/pg/php/pg_test.php:26–33

($ip, $port, $user, $password)

    private $tests = [];

    public function connect($ip, $port, $user, $password) {
        try {
            $url = "pgsql:host=$ip;port=$port;dbname=postgres";
            $this->conn = new PDO($url, $user, $password);
        } catch (PDOException $e) {
            throw new RuntimeException($e->getMessage());
        }
    }

    public function disconnect() {
        $this->conn = null;