test

        if (!empty($_POST)) {

            $image = $_FILES['image']['name'];

            $target = "img/".basename($image);

            if (move_uploaded_file($_FILES['image']['tmp_name'], $target)){

                [$imageWidth, $imageHeight] = getimagesize($target);

                if ($imageWidth <= 300 && $imageHeight <= 300) {
                    echo "Файл больше";

                } else {
                    $this->db->query("INSERT INTO post (title,postDate,preview,textFull,postIMG) VALUES(?,?,?,?,?)", $_POST['title'], $_POST['postDate'], $_POST['preview'], $_POST['full'],$image);

                    header("Location: /");

                }

            }
        }